问答题Chemistry is the study of the behavior and composition of matter. All foodsare made up of chemical substance which undergoes chemical changes when cooking 1．_______in an oven or digested within the body. The cooking of meat and vegetables induce 2．__
题目
问答题
Chemistry is the study of the behavior and composition of matter. All foodsare made up of chemical substance which undergoes chemical changes when cooking 1．_______in an oven or digested within the body. The cooking of meat and vegetables induce 2．_______chemical changes, making it more delicious; similarly the leavening action of 3．_______baking powder is a straightforward chemical change, as is the conversion ofstarch into sweet sugars by digestion. Cookery is a science requiring for a knowledge of chemistry. 4．_______This is evident from the variety of cooking products and food additives availableas cooking oils, fats, colorings, sweeteners, tenderizers, flavorings, scream-ing agents, preservatives, etc. Each is carefully prepared before painstaking 5．_______research. It is therefore essential for trained cookers to understand 6．_______chemical science in order to appreciate the chemistry nature of foods 7．_______and the changes achieving on cooking. Homeworkers should also 8．_______know cleansing agents and textiles used in the home and how the latter 9．_______responds to the effects of heat, light, water, and chemical cleansing agents. 10．_______
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更多“问答题Chemistry is the study of the behavior and composition of matter. All foodsare made up of chemical substance which undergoes chemical changes when cooking 1．_______in an oven or digested within the body. The cooking of meat and vegetables induce 2．__”相关问题
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第1题：
Which of the following may be used in cleaning up an oil spill without the permission of governmental authorities ________．
A.Straw and Skimmers only
B.Skimmers and Chemical dispersants only
C.Straw and Chemical dispersants only
D.Straw，Skimmers and Chemical dispersants
正确答案：A
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第2题：
共用题干
第二篇
Night of the Living Ants
When an ant dies,other ants move the dead insect out of the nest.This behavior is interesting to scien-
tists,who wonder how ants know for sure一and so soon一that another ant is dead.
Dong-Hwan Choe,a scientist at the University of California,found that Argentine ants have a chemical
on the outside of their bodies that signals to other ants,"I'm dead一take me away."
But there's a twist to Choe's discovery. These ants behave a little bit like zombies（僵尸）.Choe says
that the living ants一not just the dead ones一have this death chemicals. In other words,while an ant crawls
around,perhaps in a picnic or home,it's telling other ants that it's dead.
What keeps ants from hauling away the living dead? Choe found that Argentine ants have two additional
chemicals on their bodies,and these tell nearby ants something like,"Wait一I'm not dead yet."So Choe's
research turned up two sets of chemical signals in ants:one says,"I'm dead,"the other set says,"I'm not
dead yet."
Other scientists have tried to figure out how ants know when another ant is dead.If an ant is knocked
unconscious,other ants leave it alone until it wakes up.That means ants know that unmoving ants can still be
alive.
Choe suspects that when an Argentine ant dies,the chemical that says"Wait一I'm not dead yet"quickly
goes away. Once that chemical is gone,only the one that says"I'm dead"is left."It's because the dead ant
no longer smells like a living ant that it gets carried to the graveyard（墓地）,not because its body releases
new,unique chemicals after death,"said Choe.When other ants detect the"dead"chemical without the"not
dead yet" chemical,they haul away the body. This was Choe's hypothesis（假设）.
To test his hypothesis,Choe and his team put different chemicals on Argentine ant pupae（蛹）.When
the scientists used the"I'm dead"chemical,other ants quickly hauled the treated pupae away.When the sci-
entists used the"Wait一I'm not dead yet"chemical,other ants left the treated pupae alone.Choe believes
this behavior shows that the" not dead yet" chemical overrides（优先于）the" dead" chemical when picked up
by adult ants.And that when an ant dies,the"not dead yet"chemical fades away.Other nearby ants then de-
tect the remaining"dead"chemical and remove the body from the nest.The passage"Night of the Living Ants"tells us about_______________.
A:how an ant is moved out of the nest at night
B:what an ant does at night
C:how an ant finds its way in darkness
D:what happens when an ant dies答案：D解析：第二段提到：加州大学的科学家周东环发现阿根廷蚂蚁的身体能向外释放一种化学物 质来告诉同伴：“我死了，把我挪走吧。”
根据第五段第二句可推断出C项错误。
倒数第二段提到：一只阿根廷蚂蚁死后，发出“等等，我还没死呢”这一信号的化学物质 立刻消失，因此选D。
周的假设是表明“我死了”的化学物质是蚂蚁本身就有的，而非死后释放的。它和表明 “我没死”的化学物质同时存在于活着的蚂蚁身上，只不过其优先权不如表明“我没死”的化学 物质。实验结果是：当科学家用“我已死”化学物质时，蚂蚁们立刻将处理过的蛹拉走。当科 学家使用“等等，我还没死”化学物质时，其他蚂蚁并不碰这个蛹。所以，周的假设是正确的。
本文主要讲述了蚂蚁们如何迅速准确地得知同伴死了，所以选D。 第三篇 本文介绍了在山口发现的一具躺在冰上的尸体，以及由此引发的研究和种种猜测。 -
第3题：
共用题干
第二篇
Night of the Living Ants
When an ant dies,other ants move the dead insect out of the nest.This behavior is interesting to scien-
tists,who wonder how ants know for sure一and so soon一that another ant is dead.
Dong-Hwan Choe,a scientist at the University of California,found that Argentine ants have a chemical
on the outside of their bodies that signals to other ants,"I'm dead一take me away."
But there's a twist to Choe's discovery. These ants behave a little bit like zombies（僵尸）.Choe says
that the living ants一not just the dead ones一have this death chemicals. In other words,while an ant crawls
around,perhaps in a picnic or home,it's telling other ants that it's dead.
What keeps ants from hauling away the living dead? Choe found that Argentine ants have two additional
chemicals on their bodies,and these tell nearby ants something like,"Wait一I'm not dead yet."So Choe's
research turned up two sets of chemical signals in ants:one says,"I'm dead,"the other set says,"I'm not
dead yet."
Other scientists have tried to figure out how ants know when another ant is dead.If an ant is knocked
unconscious,other ants leave it alone until it wakes up.That means ants know that unmoving ants can still be
alive.
Choe suspects that when an Argentine ant dies,the chemical that says"Wait一I'm not dead yet"quickly
goes away. Once that chemical is gone,only the one that says"I'm dead"is left."It's because the dead ant
no longer smells like a living ant that it gets carried to the graveyard（墓地）,not because its body releases
new,unique chemicals after death,"said Choe.When other ants detect the"dead"chemical without the"not
dead yet" chemical,they haul away the body. This was Choe's hypothesis（假设）.
To test his hypothesis,Choe and his team put different chemicals on Argentine ant pupae（蛹）.When
the scientists used the"I'm dead"chemical,other ants quickly hauled the treated pupae away.When the sci-
entists used the"Wait一I'm not dead yet"chemical,other ants left the treated pupae alone.Choe believes
this behavior shows that the" not dead yet" chemical overrides（优先于）the" dead" chemical when picked up
by adult ants.And that when an ant dies,the"not dead yet"chemical fades away.Other nearby ants then de-
tect the remaining"dead"chemical and remove the body from the nest.According to Paragraph 7,what is the result. of the test on Choe's hypothesis?
A:It shows that his hypothesis is wrong.
B:It proves that his hypothesis is convincing.
C:It suggests that his hypothesis needs revising.
D:Not enough evidence has been found to support his hypothesis.答案：B解析：第二段提到：加州大学的科学家周东环发现阿根廷蚂蚁的身体能向外释放一种化学物 质来告诉同伴：“我死了，把我挪走吧。”
根据第五段第二句可推断出C项错误。
倒数第二段提到：一只阿根廷蚂蚁死后，发出“等等，我还没死呢”这一信号的化学物质 立刻消失，因此选D。
周的假设是表明“我死了”的化学物质是蚂蚁本身就有的，而非死后释放的。它和表明 “我没死”的化学物质同时存在于活着的蚂蚁身上，只不过其优先权不如表明“我没死”的化学 物质。实验结果是：当科学家用“我已死”化学物质时，蚂蚁们立刻将处理过的蛹拉走。当科 学家使用“等等，我还没死”化学物质时，其他蚂蚁并不碰这个蛹。所以，周的假设是正确的。
本文主要讲述了蚂蚁们如何迅速准确地得知同伴死了，所以选D。 第三篇 本文介绍了在山口发现的一具躺在冰上的尸体，以及由此引发的研究和种种猜测。 -
第4题：
共用题干
第三篇
Why So Risky in Chemical Factories
Which is safer一staying at home,traveling to work on public transport,or working in the office?Surprisingly,each of these carries the same risk,which is very low. However,what about flying compared to working in the chemical industry?Unfortunately,the former is 65 times riskier than the latter!In fact,the accident rate of workers in the chemical industry is less than that of almost any of human activity,and almost as safe as staying at home.
The trouble with the chemical industry is that when things go wrong they often cause death to those living nearby.It is this which makes chemical accidents so newsworthy.Fortunately,they are extremely rare.The most famous ones happened at Texas City(1947),Flixborough(1974),Seveso (1976),Pemex(1984)and Bhopal(1984).
Some of these are always in the minds of the people even though the loss of life was small.No one died at Seveso,and only 28 workers at Flixborough.The worst accident of all was Bhopal,where up to 3,000 were killed.The Texas City explosion of fertilizer killed 552.The Pemex fire at a storage plant for natural gas in the suburbs of Mexico City took 542 lives,just a month before the unfortunate event at Bhopal.
Some experts have discussed these accidents and used each accident to illustrate a particular danger. Thus the Texas City explosion was caused by tons of ammonium nitrate（硝酸铵）,which is safe unless stored in great quantity.The Flixborough fireball was the fault of management,which took risks to keep production going during essential repairs.The Seveso accident shows what happens if the local authorities lack knowledge of the danger on their doorstep.When the poisonous gas drifted over the town,local leaders were incapable of taking effective action.The Pemex fire was made worse by an overloaded site in an overcrowded suburb.The fire set off a chain reaction of exploding storage tanks.Yet,by a miracle,the two largest tanks did not explode.Had these caught fire,then 3,000 strong rescue team and fire fighters would all have died.Which of the following statements is true?
A:Working at the office is safer than staying at home.
B:Travelling to work on public transport is safer than working at the office.
C:Staying at home is safer than working in the chemical industry.
D:Working in the chemical industry is safer than traveling by air.答案：D解析：第一段前面两句指出“待在家里、乘坐公共交通去上班或者在办公室里工作”一样安全，而后面作者提到“the former is 65 times riskier than the latter”，前者指飞行，后者指在化工厂上班，可以看出化工厂工人风险要小得多，所以选D。
第二段一开始提到化工厂爆炸之所以引起媒体关注主要是因为“0they often cause death to those living nearby"。导致附近居民的丧生，所以选B。
第四段的第三句提到“The Flixborough fireball was the fault of management”，管理失误在Flixborough引发了火灾，所以A正确。其他爆炸都有其不同的原因。
第四段的第二句说到了德克萨斯市的爆炸案，主要是峭酸按的储存不当所引发，可以推断峭酸按是一种易燃易爆的肥料，文中说“which is safe unless stored in great quantity”，即不宜大量储存，所以选B。
推断题。专家们“用每个事故来说明某种特定的危险”。他们的分析表．明，不管是出于什么原因，如果人们采取有效的措施，所有这些事故都是本来可以避免的。选项C意思完整，因此C正确。 -
第5题：
共用题干
第三篇
Why So Risky in Chemical Factories
Which is safer一staying at home,traveling to work on public transport,or working in the office?Surprisingly,each of these carries the same risk,which is very low. However,what about flying compared to working in the chemical industry?Unfortunately,the former is 65 times riskier than the latter!In fact,the accident rate of workers in the chemical industry is less than that of almost any of human activity,and almost as safe as staying at home.
The trouble with the chemical industry is that when things go wrong they often cause death to those living nearby.It is this which makes chemical accidents so newsworthy.Fortunately,they are extremely rare.The most famous ones happened at Texas City(1947),Flixborough(1974),Seveso (1976),Pemex(1984)and Bhopal(1984).
Some of these are always in the minds of the people even though the loss of life was small.No one died at Seveso,and only 28 workers at Flixborough.The worst accident of all was Bhopal,where up to 3,000 were killed.The Texas City explosion of fertilizer killed 552.The Pemex fire at a storage plant for natural gas in the suburbs of Mexico City took 542 lives,just a month before the unfortunate event at Bhopal.
Some experts have discussed these accidents and used each accident to illustrate a particular danger. Thus the Texas City explosion was caused by tons of ammonium nitrate（硝酸铵）,which is safe unless stored in great quantity.The Flixborough fireball was the fault of management,which took risks to keep production going during essential repairs.The Seveso accident shows what happens if the local authorities lack knowledge of the danger on their doorstep.When the poisonous gas drifted over the town,local leaders were incapable of taking effective action.The Pemex fire was made worse by an overloaded site in an overcrowded suburb.The fire set off a chain reaction of exploding storage tanks.Yet,by a miracle,the two largest tanks did not explode.Had these caught fire,then 3,000 strong rescue team and fire fighters would all have died.From the discussion among some experts we may conclude that________.
A:to avoid any accidents we should not repair the facilities in chemical industry
B:the local authorities should not be concerned with the production of the chemical industry
C:all these accidents could have been avoided or controlled if effective measure had been taken
D:natural gas stored in very large tanks is always safe答案：C解析：第一段前面两句指出“待在家里、乘坐公共交通去上班或者在办公室里工作”一样安全，而后面作者提到“the former is 65 times riskier than the latter”，前者指飞行，后者指在化工厂上班，可以看出化工厂工人风险要小得多，所以选D。
第二段一开始提到化工厂爆炸之所以引起媒体关注主要是因为“0they often cause death to those living nearby"。导致附近居民的丧生，所以选B。
第四段的第三句提到“The Flixborough fireball was the fault of management”，管理失误在Flixborough引发了火灾，所以A正确。其他爆炸都有其不同的原因。
第四段的第二句说到了德克萨斯市的爆炸案，主要是峭酸按的储存不当所引发，可以推断峭酸按是一种易燃易爆的肥料，文中说“which is safe unless stored in great quantity”，即不宜大量储存，所以选B。
推断题。专家们“用每个事故来说明某种特定的危险”。他们的分析表．明，不管是出于什么原因，如果人们采取有效的措施，所有这些事故都是本来可以避免的。选项C意思完整，因此C正确。 -
第6题：
Which of the following is true when Bob, a technician, is setting default security permissions on a folder?（）
- A、There are no significant changes to other files.
- B、The created folder inherits the most restrictive permissions within the folder.
- C、The permissions are inherited by all files and folders within that folder.
- D、All folders within that folder are given a restrictive password.
正确答案:C -
第7题：
Which two statements apply when a user has entered private configuration mode by typing configure private? （）
- A、All users have their own active configuration
- B、All users have their own private candidate configuration
- C、When a user commits, all nonconflicting changes made by all users are commited
- D、When a user commits, only the user's own changes are commited
正确答案:B,D -
第8题：
单选题Eventually chemical changes（）the generation of petroleum.Ahand in
Bgive in
Ctake in
Dresult in
正确答案： B解析： 暂无解析 -
第9题：
填空题When we arrived, there was a smell of cooking (come) ____ from the kitchen.正确答案： coming解析：
本题考查现在分词的用法。句意：我们到达时，一股饭香从厨房飘出。come和smell是主动关系，使用现在分词coming，表示正在进行。 -
第10题：
单选题Which of the following statements is correct concerning the “flash point ” of a liquid?（）AIt is lower than the ignition temperature
BIt is the temperature at which a substance will spontaneously ignite
CIt is the temperature at which a substance, when ignited, will continue to bum
DIt is the temperature at which the released vapors will fall within the explosive range
正确答案： A解析： 暂无解析 -
第11题：
问答题Practice 5 If you think American cooking means opening a package and tossing the contents into the microwave, think again. On the one hand, it's true that Americans thrive on cold cereal for breakfast, sandwiches for lunch and instant dinners. From busy homemakers to professional people, many Americans enjoy the convenience of prepackaged meals that can be ready to serve in 10 minutes or less. On the other hand, many Americans recognize the value of cooking skills. Most Americans will admit that there's nothing better than a good home-cooked meal. Probably every cook has his or her own cooking style. But there are some basic techniques and principles that most people follow. For example, baking is a primary method of preparing food in America. The dinner menu often has roast meats and other baked goods. For that reason, Americans would find it next to impossible to live without an oven. American cooks give special attention to the balance of foods, too. In planning a big meal they try to include a meat, a few vegetables, some bread or pasta and often a dessert. They also like to make sure the meal is colorful. Having several different colors of food on the plate usually makes for a healthy meal.正确答案： 【参考译文】
假如您以为美式烹饪就是打开一个料理盒,将里头的东西抛进微波炉加热,那你得改变想法了。从某一方面来说,美国人靠吃早餐的冷麦片、午餐的三明治及速食晚餐而发育健壮,这倒是真的。从忙碌的家庭主妇到上班族,许多美国人喜欢享受事先包装好的便餐所带来的便利——这些速食在10分钟或更短时间内即可上桌。但是从另一个方面来看,许多美国人都认同厨艺的价值。大多数美国人都承认没有什么能比得上一顿自家做的关食。
大概每一位厨师都有他自己的烹饪方式,但仍有一些基本方法和原则是大多数人所遵循的。例如烘培在美国是一种主要的烹饪方法,晚餐菜单上通常有烤肉及其他烘培食物。因此,美国人会觉得没有烤箱几乎是无法生活。美国厨师们也特别留意食物营养的均衡。在准备一顿大餐时,他们会试着加进一道肉、几种蔬菜、一些面包或面食,而且通常还有一道甜点。他们还喜欢使餐点色彩亮丽,盘中不同色彩食物的搭配构成了健康饮食。解析： 暂无解析 -
第12题：
单选题Every field of chemistry _____ different chemical reactions.Aholds
Bconsists
Ccomposes
Dinvolves
正确答案： B解析： -
第13题：
共用题干
第二篇
Night of the Living Ants
When an ant dies,other ants move the dead insect out of the nest.This behavior is interesting to scien-
tists,who wonder how ants know for sure一and so soon一that another ant is dead.
Dong-Hwan Choe,a scientist at the University of California,found that Argentine ants have a chemical
on the outside of their bodies that signals to other ants,"I'm dead一take me away."
But there's a twist to Choe's discovery. These ants behave a little bit like zombies（僵尸）.Choe says
that the living ants一not just the dead ones一have this death chemicals. In other words,while an ant crawls
around,perhaps in a picnic or home,it's telling other ants that it's dead.
What keeps ants from hauling away the living dead? Choe found that Argentine ants have two additional
chemicals on their bodies,and these tell nearby ants something like,"Wait一I'm not dead yet."So Choe's
research turned up two sets of chemical signals in ants:one says,"I'm dead,"the other set says,"I'm not
dead yet."
Other scientists have tried to figure out how ants know when another ant is dead.If an ant is knocked
unconscious,other ants leave it alone until it wakes up.That means ants know that unmoving ants can still be
alive.
Choe suspects that when an Argentine ant dies,the chemical that says"Wait一I'm not dead yet"quickly
goes away. Once that chemical is gone,only the one that says"I'm dead"is left."It's because the dead ant
no longer smells like a living ant that it gets carried to the graveyard（墓地）,not because its body releases
new,unique chemicals after death,"said Choe.When other ants detect the"dead"chemical without the"not
dead yet" chemical,they haul away the body. This was Choe's hypothesis（假设）.
To test his hypothesis,Choe and his team put different chemicals on Argentine ant pupae（蛹）.When
the scientists used the"I'm dead"chemical,other ants quickly hauled the treated pupae away.When the sci-
entists used the"Wait一I'm not dead yet"chemical,other ants left the treated pupae alone.Choe believes
this behavior shows that the" not dead yet" chemical overrides（优先于）the" dead" chemical when picked up
by adult ants.And that when an ant dies,the"not dead yet"chemical fades away.Other nearby ants then de-
tect the remaining"dead"chemical and remove the body from the nest.According to Choe's hypothesis,_______________.
A:an ant still smells like a living one when it dies
B:the"I am dead"chemical leaves the ant's body when it dies
C:the"I am not dead yet"chemical is left when an ant dies
D:the"I am not dead yet"chemical quickly goes away when it dies答案：D解析：第二段提到：加州大学的科学家周东环发现阿根廷蚂蚁的身体能向外释放一种化学物 质来告诉同伴：“我死了，把我挪走吧。”
根据第五段第二句可推断出C项错误。
倒数第二段提到：一只阿根廷蚂蚁死后，发出“等等，我还没死呢”这一信号的化学物质 立刻消失，因此选D。
周的假设是表明“我死了”的化学物质是蚂蚁本身就有的，而非死后释放的。它和表明 “我没死”的化学物质同时存在于活着的蚂蚁身上，只不过其优先权不如表明“我没死”的化学 物质。实验结果是：当科学家用“我已死”化学物质时，蚂蚁们立刻将处理过的蛹拉走。当科 学家使用“等等，我还没死”化学物质时，其他蚂蚁并不碰这个蛹。所以，周的假设是正确的。
本文主要讲述了蚂蚁们如何迅速准确地得知同伴死了，所以选D。 第三篇 本文介绍了在山口发现的一具躺在冰上的尸体，以及由此引发的研究和种种猜测。 -
第14题：
共用题干
第二篇
Night of the Living Ants
When an ant dies,other ants move the dead insect out of the nest.This behavior is interesting to scien-
tists,who wonder how ants know for sure一and so soon一that another ant is dead.
Dong-Hwan Choe,a scientist at the University of California,found that Argentine ants have a chemical
on the outside of their bodies that signals to other ants,"I'm dead一take me away."
But there's a twist to Choe's discovery. These ants behave a little bit like zombies（僵尸）.Choe says
that the living ants一not just the dead ones一have this death chemicals. In other words,while an ant crawls
around,perhaps in a picnic or home,it's telling other ants that it's dead.
What keeps ants from hauling away the living dead? Choe found that Argentine ants have two additional
chemicals on their bodies,and these tell nearby ants something like,"Wait一I'm not dead yet."So Choe's
research turned up two sets of chemical signals in ants:one says,"I'm dead,"the other set says,"I'm not
dead yet."
Other scientists have tried to figure out how ants know when another ant is dead.If an ant is knocked
unconscious,other ants leave it alone until it wakes up.That means ants know that unmoving ants can still be
alive.
Choe suspects that when an Argentine ant dies,the chemical that says"Wait一I'm not dead yet"quickly
goes away. Once that chemical is gone,only the one that says"I'm dead"is left."It's because the dead ant
no longer smells like a living ant that it gets carried to the graveyard（墓地）,not because its body releases
new,unique chemicals after death,"said Choe.When other ants detect the"dead"chemical without the"not
dead yet" chemical,they haul away the body. This was Choe's hypothesis（假设）.
To test his hypothesis,Choe and his team put different chemicals on Argentine ant pupae（蛹）.When
the scientists used the"I'm dead"chemical,other ants quickly hauled the treated pupae away.When the sci-
entists used the"Wait一I'm not dead yet"chemical,other ants left the treated pupae alone.Choe believes
this behavior shows that the" not dead yet" chemical overrides（优先于）the" dead" chemical when picked up
by adult ants.And that when an ant dies,the"not dead yet"chemical fades away.Other nearby ants then de-
tect the remaining"dead"chemical and remove the body from the nest.Which of the following statements is NOT true of ants?
A:Ants know very soon that?another ant is dead.
B:When an ant is dead,others move its body out of the nest.
C:If an ant is unconscious,it is moved out of the nest.
D:Living ants have the"I'm dead"chemical on their bodies.答案：C解析：第二段提到：加州大学的科学家周东环发现阿根廷蚂蚁的身体能向外释放一种化学物 质来告诉同伴：“我死了，把我挪走吧。”
根据第五段第二句可推断出C项错误。
倒数第二段提到：一只阿根廷蚂蚁死后，发出“等等，我还没死呢”这一信号的化学物质 立刻消失，因此选D。
周的假设是表明“我死了”的化学物质是蚂蚁本身就有的，而非死后释放的。它和表明 “我没死”的化学物质同时存在于活着的蚂蚁身上，只不过其优先权不如表明“我没死”的化学 物质。实验结果是：当科学家用“我已死”化学物质时，蚂蚁们立刻将处理过的蛹拉走。当科 学家使用“等等，我还没死”化学物质时，其他蚂蚁并不碰这个蛹。所以，周的假设是正确的。
本文主要讲述了蚂蚁们如何迅速准确地得知同伴死了，所以选D。 第三篇 本文介绍了在山口发现的一具躺在冰上的尸体，以及由此引发的研究和种种猜测。 -
第15题：
共用题干
第二篇
Night of the Living Ants
When an ant dies,other ants move the dead insect out of the nest.This behavior is interesting to scien-
tists,who wonder how ants know for sure一and so soon一that another ant is dead.
Dong-Hwan Choe,a scientist at the University of California,found that Argentine ants have a chemical
on the outside of their bodies that signals to other ants,"I'm dead一take me away."
But there's a twist to Choe's discovery. These ants behave a little bit like zombies（僵尸）.Choe says
that the living ants一not just the dead ones一have this death chemicals. In other words,while an ant crawls
around,perhaps in a picnic or home,it's telling other ants that it's dead.
What keeps ants from hauling away the living dead? Choe found that Argentine ants have two additional
chemicals on their bodies,and these tell nearby ants something like,"Wait一I'm not dead yet."So Choe's
research turned up two sets of chemical signals in ants:one says,"I'm dead,"the other set says,"I'm not
dead yet."
Other scientists have tried to figure out how ants know when another ant is dead.If an ant is knocked
unconscious,other ants leave it alone until it wakes up.That means ants know that unmoving ants can still be
alive.
Choe suspects that when an Argentine ant dies,the chemical that says"Wait一I'm not dead yet"quickly
goes away. Once that chemical is gone,only the one that says"I'm dead"is left."It's because the dead ant
no longer smells like a living ant that it gets carried to the graveyard（墓地）,not because its body releases
new,unique chemicals after death,"said Choe.When other ants detect the"dead"chemical without the"not
dead yet" chemical,they haul away the body. This was Choe's hypothesis（假设）.
To test his hypothesis,Choe and his team put different chemicals on Argentine ant pupae（蛹）.When
the scientists used the"I'm dead"chemical,other ants quickly hauled the treated pupae away.When the sci-
entists used the"Wait一I'm not dead yet"chemical,other ants left the treated pupae alone.Choe believes
this behavior shows that the" not dead yet" chemical overrides（优先于）the" dead" chemical when picked up
by adult ants.And that when an ant dies,the"not dead yet"chemical fades away.Other nearby ants then de-
tect the remaining"dead"chemical and remove the body from the nest.What is meant by"death chemical"mentioned in Paragraph 3?
A:A chemical that contains poison.
B:A chemical that causes death.
C:A chemical that announces death.
D:A chemical that prevents death.答案：C解析：第二段提到：加州大学的科学家周东环发现阿根廷蚂蚁的身体能向外释放一种化学物 质来告诉同伴：“我死了，把我挪走吧。”
根据第五段第二句可推断出C项错误。
倒数第二段提到：一只阿根廷蚂蚁死后，发出“等等，我还没死呢”这一信号的化学物质 立刻消失，因此选D。
周的假设是表明“我死了”的化学物质是蚂蚁本身就有的，而非死后释放的。它和表明 “我没死”的化学物质同时存在于活着的蚂蚁身上，只不过其优先权不如表明“我没死”的化学 物质。实验结果是：当科学家用“我已死”化学物质时，蚂蚁们立刻将处理过的蛹拉走。当科 学家使用“等等，我还没死”化学物质时，其他蚂蚁并不碰这个蛹。所以，周的假设是正确的。
本文主要讲述了蚂蚁们如何迅速准确地得知同伴死了，所以选D。 第三篇 本文介绍了在山口发现的一具躺在冰上的尸体，以及由此引发的研究和种种猜测。 -
第16题：
共用题干
第三篇
Why So Risky in Chemical Factories
Which is safer一staying at home,traveling to work on public transport,or working in the office?Surprisingly,each of these carries the same risk,which is very low. However,what about flying compared to working in the chemical industry?Unfortunately,the former is 65 times riskier than the latter!In fact,the accident rate of workers in the chemical industry is less than that of almost any of human activity,and almost as safe as staying at home.
The trouble with the chemical industry is that when things go wrong they often cause death to those living nearby.It is this which makes chemical accidents so newsworthy.Fortunately,they are extremely rare.The most famous ones happened at Texas City(1947),Flixborough(1974),Seveso (1976),Pemex(1984)and Bhopal(1984).
Some of these are always in the minds of the people even though the loss of life was small.No one died at Seveso,and only 28 workers at Flixborough.The worst accident of all was Bhopal,where up to 3,000 were killed.The Texas City explosion of fertilizer killed 552.The Pemex fire at a storage plant for natural gas in the suburbs of Mexico City took 542 lives,just a month before the unfortunate event at Bhopal.
Some experts have discussed these accidents and used each accident to illustrate a particular danger. Thus the Texas City explosion was caused by tons of ammonium nitrate（硝酸铵）,which is safe unless stored in great quantity.The Flixborough fireball was the fault of management,which took risks to keep production going during essential repairs.The Seveso accident shows what happens if the local authorities lack knowledge of the danger on their doorstep.When the poisonous gas drifted over the town,local leaders were incapable of taking effective action.The Pemex fire was made worse by an overloaded site in an overcrowded suburb.The fire set off a chain reaction of exploding storage tanks.Yet,by a miracle,the two largest tanks did not explode.Had these caught fire,then 3,000 strong rescue team and fire fighters would all have died.From the passage we know that ammonium nitrate is a kind of________.
A:natural gas,which can easily catch fire
B:fertilizer,which can't be stored in a great quantity
C:poisonous substance,which can't be used in overcrowded areas
D:fuel,which is stored in large tanks答案：B解析：第一段前面两句指出“待在家里、乘坐公共交通去上班或者在办公室里工作”一样安全，而后面作者提到“the former is 65 times riskier than the latter”，前者指飞行，后者指在化工厂上班，可以看出化工厂工人风险要小得多，所以选D。
第二段一开始提到化工厂爆炸之所以引起媒体关注主要是因为“0they often cause death to those living nearby"。导致附近居民的丧生，所以选B。
第四段的第三句提到“The Flixborough fireball was the fault of management”，管理失误在Flixborough引发了火灾，所以A正确。其他爆炸都有其不同的原因。
第四段的第二句说到了德克萨斯市的爆炸案，主要是峭酸按的储存不当所引发，可以推断峭酸按是一种易燃易爆的肥料，文中说“which is safe unless stored in great quantity”，即不宜大量储存，所以选B。
推断题。专家们“用每个事故来说明某种特定的危险”。他们的分析表．明，不管是出于什么原因，如果人们采取有效的措施，所有这些事故都是本来可以避免的。选项C意思完整，因此C正确。 -
第17题：
共用题干
第三篇
Why So Risky in Chemical Factories
Which is safer一staying at home,traveling to work on public transport,or working in the office?Surprisingly,each of these carries the same risk,which is very low. However,what about flying compared to working in the chemical industry?Unfortunately,the former is 65 times riskier than the latter!In fact,the accident rate of workers in the chemical industry is less than that of almost any of human activity,and almost as safe as staying at home.
The trouble with the chemical industry is that when things go wrong they often cause death to those living nearby.It is this which makes chemical accidents so newsworthy.Fortunately,they are extremely rare.The most famous ones happened at Texas City(1947),Flixborough(1974),Seveso (1976),Pemex(1984)and Bhopal(1984).
Some of these are always in the minds of the people even though the loss of life was small.No one died at Seveso,and only 28 workers at Flixborough.The worst accident of all was Bhopal,where up to 3,000 were killed.The Texas City explosion of fertilizer killed 552.The Pemex fire at a storage plant for natural gas in the suburbs of Mexico City took 542 lives,just a month before the unfortunate event at Bhopal.
Some experts have discussed these accidents and used each accident to illustrate a particular danger. Thus the Texas City explosion was caused by tons of ammonium nitrate（硝酸铵）,which is safe unless stored in great quantity.The Flixborough fireball was the fault of management,which took risks to keep production going during essential repairs.The Seveso accident shows what happens if the local authorities lack knowledge of the danger on their doorstep.When the poisonous gas drifted over the town,local leaders were incapable of taking effective action.The Pemex fire was made worse by an overloaded site in an overcrowded suburb.The fire set off a chain reaction of exploding storage tanks.Yet,by a miracle,the two largest tanks did not explode.Had these caught fire,then 3,000 strong rescue team and fire fighters would all have died.Chemical accidents are usually important enough to be reported as news because________.
A:they are very rare
B:they often cause loss of life living nearby
C:they always occur in big cities
D:they arouse the interest of all the readers答案：B解析：第一段前面两句指出“待在家里、乘坐公共交通去上班或者在办公室里工作”一样安全，而后面作者提到“the former is 65 times riskier than the latter”，前者指飞行，后者指在化工厂上班，可以看出化工厂工人风险要小得多，所以选D。
第二段一开始提到化工厂爆炸之所以引起媒体关注主要是因为“0they often cause death to those living nearby"。导致附近居民的丧生，所以选B。
第四段的第三句提到“The Flixborough fireball was the fault of management”，管理失误在Flixborough引发了火灾，所以A正确。其他爆炸都有其不同的原因。
第四段的第二句说到了德克萨斯市的爆炸案，主要是峭酸按的储存不当所引发，可以推断峭酸按是一种易燃易爆的肥料，文中说“which is safe unless stored in great quantity”，即不宜大量储存，所以选B。
推断题。专家们“用每个事故来说明某种特定的危险”。他们的分析表．明，不管是出于什么原因，如果人们采取有效的措施，所有这些事故都是本来可以避免的。选项C意思完整，因此C正确。 -
第18题：
Which two statements apply when a user has entered private configuration mode by typing configure private?（）
- A、All users have their own active configuration.
- B、All users have their own private candidate configuration.
- C、When a user commits, all nonconflicting changes made by all users are committed.
- D、When a user commits, only the user's own changes are committed.
正确答案:B,D -
第19题：
问答题Chemistry is the study of the behavior and composition of matter. All foods aremade up of chemical substance which undergoes chemical changes when cooking 1．______in an oven or digested within the body. The cooking of meat and vegetables induce 2．______chemical changes, making it more delicious; similarly the leavening action of 3．______baking powder is a straightforward chemical change, as is the conversion ofstarch into sweet sugars by digestion.Cookery is a science requiring a knowledge of chemistry. 4．______This is evident from the variety of cooking products and food additives availableas cooking oils, fats, colorings, sweeteners, tenderizers, flavorings, screamingagents, preservatives, etc. Each is carefully prepared before painstaking 5．______research. It is therefore essential for trained cookers to understand 6．______chemical science in order to appreciate the chemistry nature of foods 7．______and the changes achieving on cooking. Homeworkers should also 8．______know cleansing agents and textiles used in the home and how the latter 9．______responds to the effects of heat, light, water, and chemical cleansing agents. 10．______正确答案：
1.cooking改为cooked 主语all foods是cook的逻辑宾语,因此应使用过去分词形式。
2.induce改为induces 句子主语是the cooking而不是meat and vegetables,动词应使用单数。
3.it改为them 因为其先行词为复数名词短语“the meat and vegetables”。
4.√
5.before改为after 根据文意可以推断这里要表达“之后”的意思,使用before不合逻辑。
6.cookers改为cooks cooker厨房用具,cook厨师。
7.chemistry改为chemical chemistry是名词,此处应用其形容词形式修饰名词。
8.achieving改为achieved 此处要修饰changes,应使用achieved,因为changes不能主动“实现”。
9.在know后加about know认识,知道,know about表达“对……有所了解”之意。
10.responds改为respond the latter指代的是复数名词textiles,故谓语动词应使用复数。解析： 暂无解析 -
第20题：
问答题Chemistry is the study of the behavior and composition of matter. All foodsare made up of chemical substance which undergoes chemical changes when cooking 1．_______in an oven or digested within the body. The cooking of meat and vegetables induce 2．_______chemical changes, making it more delicious; similarly the leavening action of 3．_______baking powder is a straightforward chemical change, as is the conversion ofstarch into sweet sugars by digestion. Cookery is a science requiring for a knowledge of chemistry. 4．_______This is evident from the variety of cooking products and food additives availableas cooking oils, fats, colorings, sweeteners, tenderizers, flavorings, scream-ing agents, preservatives, etc. Each is carefully prepared before painstaking 5．_______research. It is therefore essential for trained cookers to understand 6．_______chemical science in order to appreciate the chemistry nature of foods 7．_______and the changes achieving on cooking. Homeworkers should also 8．_______know cleansing agents and textiles used in the home and how the latter 9．_______responds to the effects of heat, light, water, and chemical cleansing agents. 10．_______正确答案：
1.cooking改为cooked 主语all foods是cook的逻辑宾语,因此应使用过去分词形式。
2.induce改为induces 句子主语是the cooking而不是meat and vegetables,动词应使用单数。
3.it改为them 因为其先行词为复数名词短语“the meat and vegetables”。
4.去掉for require是及物动词。
5.before改为after 根据文意可以推断这里要表达“之后”的意思,使用before不合逻辑。
6.cookers改为cooks cooker厨房用具,cook厨师。
7.chemistry改为chemical chemistry是名词,名词不能用来修饰名词。
8.achieving改为achieved 此处要修饰changes,应使用achieved,因为changes不能主动“实现”。
9.在know后加about know认识,知道,know about表达“对……有所了解”之意。
10.responds改为respond,the latter指代的是复数名词textiles,故谓语动词应使用复数。解析： 暂无解析 -
第21题：
单选题When you become frightened, many physical changes occur within your body. Your heartbeat and responses quicken; your pupils dilate(扩大 and _______more light.Apermit
Ballow
Cadmit
Dlet
正确答案： C解析： -
第22题：
单选题Which of the following is true when Bob, a technician, is setting default security permissions on a folder?（）AThere are no significant changes to other files.
BThe created folder inherits the most restrictive permissions within the folder.
CThe permissions are inherited by all files and folders within that folder.
DAll folders within that folder are given a restrictive password.
正确答案： C解析： 暂无解析 -
第23题：
多选题Which two statements apply when a user has entered private configuration mode by typing configure private? （）AAll users have their own active configuration
BAll users have their own private candidate configuration
CWhen a user commits, all nonconflicting changes made by all users are commited
DWhen a user commits, only the user's own changes are commited
正确答案： D,A解析： 暂无解析 -
第24题：
单选题The process that occurs when heat is generated by a chemical reaction within a substance and continues to a point of ignition is known as （）.Achemical ignition
Bspontaneous combustion
Cchemical combustion
Dradiation ignition
正确答案： A解析： 暂无解析