共用题干 The Smog（烟雾）For over a month,lndonesia was in crisis.Forest fires raged out of control as the country suffered its worst drought for 50 years.Smoke from the fires mixed with sunlight and hot dry air to form a cloud of smog.This pollution quickly spre
题目
共用题干
The Smog（烟雾）
For over a month,lndonesia was in crisis.Forest fires raged out of control as the
country suffered its worst drought for 50 years.Smoke from the fires mixed with sunlight and
hot dry air to form a cloud of smog.This pollution quickly spread and within days it was
hanging over neighbouring countries including Malaysia,Singapore and Thailand.
When the smoke combined with pollution from factories and cars,it soon became
poisonous（有毒的）.Dangerous amounts of CO became trapped under the smog and
pollution levels rose. People wheezed（喘息）and coughed as they left the house and their
eyes watered immediately.
The smog made it impossible to see across streets and whole cities disappeared as
grey soot（烟灰）covered everything. In some areas, water was hosed（用胶管浇）from
high-rise city buildings to try and break up the smog.
Finally,heavy rains,which came in November,put out the fires and cleared the air.
But the environmental costs and health problems will remain.Many people from South-
Eastern Asian cities already suffer from breathing huge amounts of car exhaust fumes（汽车
排放的废气）and factory pollution. Breathing problems could well increase and many non-
sufferers may have difficulties for the first time.Wildlife has suffered too.In lowland forests,elephants,deer,and tigers have been driven out of their homes by smog.
But smog is not just an Asian problem.In fact,the word was first used in London in
1905 to describe the mixture of smoke and thick fog.Fog often hung over the capital.
Sometimes the smog was so thick and poisonous that people were killed by breathing
problems or in accidents.About 4, 000 Londoners died within five days as a result of thick
smog in 1952.
The Smog（烟雾）
For over a month,lndonesia was in crisis.Forest fires raged out of control as the
country suffered its worst drought for 50 years.Smoke from the fires mixed with sunlight and
hot dry air to form a cloud of smog.This pollution quickly spread and within days it was
hanging over neighbouring countries including Malaysia,Singapore and Thailand.
When the smoke combined with pollution from factories and cars,it soon became
poisonous（有毒的）.Dangerous amounts of CO became trapped under the smog and
pollution levels rose. People wheezed（喘息）and coughed as they left the house and their
eyes watered immediately.
The smog made it impossible to see across streets and whole cities disappeared as
grey soot（烟灰）covered everything. In some areas, water was hosed（用胶管浇）from
high-rise city buildings to try and break up the smog.
Finally,heavy rains,which came in November,put out the fires and cleared the air.
But the environmental costs and health problems will remain.Many people from South-
Eastern Asian cities already suffer from breathing huge amounts of car exhaust fumes（汽车
排放的废气）and factory pollution. Breathing problems could well increase and many non-
sufferers may have difficulties for the first time.Wildlife has suffered too.In lowland forests,elephants,deer,and tigers have been driven out of their homes by smog.
But smog is not just an Asian problem.In fact,the word was first used in London in
1905 to describe the mixture of smoke and thick fog.Fog often hung over the capital.
Sometimes the smog was so thick and poisonous that people were killed by breathing
problems or in accidents.About 4, 000 Londoners died within five days as a result of thick
smog in 1952.
Water was used to try to break up the smog.
A:Right
B:Wrong
C:Not mentioned
A:Right
B:Wrong
C:Not mentioned
相似考题
更多“共用题干 The Smog（烟雾）For over a month,lndonesia was in crisis.Forest fires raged out of control as the country suffered its worst drought for 50 years.Smoke from the fires mixed with sunlight and hot dry air to form a cloud of smog.This pollution quickly spre”相关问题
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第1题：
Steam smoke will occur when ______.
A.extremely cold air from shore passes over warmer water
B.warm dry air from shore passes over cooler water
C.cold ocean water evaporates into warm air
D.cool rain passes through a warm air mass
正确答案：A
-
第2题：
共用题干
The Smog（烟雾）
For over a month,Indonesia was in crisis.Forest fires raged out of control as the
country suffered its worst drought for 50 years.Smoke from the fires mixed with sunlight and
hot dry air to form a cloud of smog.This pollution quickly spread and within days it was
hanging over neighbouring countries including Malaysia,Singapore and Thailand.
When the smoke combined with pollution from factories and cars,it soon became
poisonous（有毒的）.Dangerous amounts of CO became trapped under the smog and
pollution levels rose. People wheezed（喘息）and coughed as they left the house and their
eyes watered immediately.
The smog made it impossible to see across streets and whole cities disappeared as
grey soot（烟灰） covered everything. In some areas, water was hosed（用胶管浇）from
high-rise city buildings to try and break up the smog.
Finally,heavy rains,which came in November,put out the fires and cleared the air.
But the environmental costs and health problems will remain.Many people from South-
Eastern Asian cities already suffer from breathing huge amounts of car exhaust fumes（汽车
排放的废气）and factory pollution. Breathing problems could well increase and many non-
sufferers may have difficulties for the first time.Wildlife has suffered too.In lowland
forests,elephants,deer,and tigers have been driven out of their homes by smog.
But smog is not just an Asian problem.In fact,the word was first used in London in
1 905 to describe the mixture of smoke and thick fog.Fog often hung over the capital.
Sometimes the smog was so thick and poisonous that people were killed by breathing
problems or in accidents.About 4, 000 Londoners died within five days as a result of thick
smog in 1952.The forest animals haven't been affected by the smog.
A:Right
B:Wrong
C:Not mentioned答案：B解析： -
第3题：
共用题干
The Smog（烟雾）
For over a month,Indonesia was in crisis.Forest fires raged out of control as the
country suffered its worst drought for 50 years.Smoke from the fires mixed with sunlight and
hot dry air to form a cloud of smog.This pollution quickly spread and within days it was
hanging over neighbouring countries including Malaysia,Singapore and Thailand.
When the smoke combined with pollution from factories and cars,it soon became
poisonous（有毒的）.Dangerous amounts of CO became trapped under the smog and
pollution levels rose. People wheezed（喘息）and coughed as they left the house and their
eyes watered immediately.
The smog made it impossible to see across streets and whole cities disappeared as
grey soot（烟灰） covered everything. In some areas, water was hosed（用胶管浇）from
high-rise city buildings to try and break up the smog.
Finally,heavy rains,which came in November,put out the fires and cleared the air.
But the environmental costs and health problems will remain.Many people from South-
Eastern Asian cities already suffer from breathing huge amounts of car exhaust fumes（汽车
排放的废气）and factory pollution. Breathing problems could well increase and many non-
sufferers may have difficulties for the first time.Wildlife has suffered too.In lowland
forests,elephants,deer,and tigers have been driven out of their homes by smog.
But smog is not just an Asian problem.In fact,the word was first used in London in
1 905 to describe the mixture of smoke and thick fog.Fog often hung over the capital.
Sometimes the smog was so thick and poisonous that people were killed by breathing
problems or in accidents.About 4, 000 Londoners died within five days as a result of thick
smog in 1952.Indonesia was in crisis because of the drought.
A:Right
B:Wrong
C:Not mentioned答案：A解析： -
第4题：
共用题干
Underground Coal Fires
Coal burning deep underground in China,India and Indonesia is threatening the environment and human life , scientists have warned.These large-scale______(51)blazes（火焰）cause the ground temperature to heat up and kill surrounding vegetation,produce greenhouse gases and can______(52) ignite（点燃）forest fires , a group of scientists told the annual meeting of the American Association for the
Advancement of Science in Denver.The resulting______(53)of poisonous elements like mercury can also pollute local water sources and soils,they warned.
"Coal fires are a global disaster,"said Associate Professor Glenn Stracher of East Georgia College in
Swainsboro,USA.But______(54)few people know about them.
Coal can heat up on its own,and eventually catch fire and bum,if there is a continuous oxygen supply.The heat produced is not caused to______(55)and under the right combinations of sunlight and oxygen,can trigger spontaneous（自发的）catching fire and buming.This can occur underground , in coal stockpiles, abandoned mines or even as coal is transported.______(56)fires in China consume up to 200 million tons of coal per year,delegates were told.In______(57),the U.S.economy consumes about one billion tons of coal annually,said Stracher,______(58)analysis of the likely impact of coal fires has been accepted for publication in the International Journal of Coal Ecology.______(59)underway,coal fires can bum for decades,even centuries.In the process,they release large______(60)of greenhouse gases,poisonous fumes and black particles into the atmosphere.
The members of the panel discussed the______(61)these fires may be having on global and regional climate change,and agreed that the underground nature of the fires makes them difficult to______(62).Ultimately,the remote sensing and other techniques should allow scientists to______(63)how much carbon dioxide these fires are emitting（释放）.One suggested______(64)of containing the fires was presented by Gary Colaizzi,of the engineering firm Goodson,which has developed a heat-resistant grout（灌浆）,which is designed to be pumped into the coal fire to______(65)the oxygen supply._________65
A:take up
B:cut off
C:back up
D:run out答案：B解析：由文章标题和第一段第一句可知，这里指的应该是在地下燃烧的火焰。underground地下的；house房子，房屋；sky天空；water水。
煤在地下燃烧产生的火焰能够使地表温度升高，并且毁坏周围的植被，产生温室气体，甚至能点燃森林。even在这里表示程度的递进。only仅仅，只有；just仅仅；even甚至，更then 然后。
此处表示“有毒气体的释放”，表示气体的释放应用"release"。 paste糨糊；consumption 消费；release释放；elimination消除，根除。
地下煤的燃烧是一种全球性的灾难，令人惊奇的是却很少有人了解，这里表示的是一种惊讶。happily愉快地；surprisingly惊人地，出人意料地；traditionally传统地；fashionably时髦地。
在有阳光和氧气的情况下，产生的热量会引起自燃，可见煤产生的热量并没有消失。 disappear消失；exchange交换；regenerate再生；transfer转换，转变。
此处表示：这样的火灾在中国每年消耗的煤多达2亿吨。most大多数，大部分；some一些，某些；such这种的，这样的；many许多，很多。
in comparison表示“与……相比”，用在这里表示中国发生自燃的煤量与美国经济消耗的煤量的比较。case案件，情况；time时间，时代；comparison比较；turn转动，旋转。
空格后的analysis与空格前的先行词Stracher是所有关系，因此用whose来引导这个定语从句，并在从句中作主语。which哪一个，一般用来引导先行词为物的定语从句；who谁，常用来引导先行词为人的定语从句，并在从句中作主语；what什么，常用来引导疑问句或名词性从句。
这句话的意思是：地下的煤一旦燃烧，火焰将会持续几十年，甚至几百年。因此用连词 once。 yet然而；unless除非；once一旦；although尽管，虽然。
volume表示the amount of sth.，意思是“量，额”，用在这里表明有毒气体、温室气体以及黑色颗粒的量很大。data数据；figure数字；volume量，分量；image影像，形象。
科研小组的成员讨论的是这些火焰的影响，have impact on是常用搭配，表示对……有影响。impact影响，作用；attack袭击，攻击；identification鉴定，识别；implication含义，蕴含。
这句话表明，在地下燃烧的特质使这些火焰很难被探测到。develop开发，发展；relieve 解除，缓解；supply提供，供应；detect侦察，发现，探测。
根据后文的how much可知，这里指的是对产生的二氧化碳的量的评估。experiment实验；estimate评估；gather收集，聚集；illustrate说明，解释。
Gary Colaizzi提出的是一种控制这些火焰的方法，因此用method来表示。cause原因，动机；treatment治疗，疗法；rule规则，规定；method方法，方式。
切断氧气的供应，应该用cut off来表示。take up占据；cut off切除，切断；back up支持； run out用完，耗尽。 -
第5题：
共用题干
Rockets in the Sky
If someone asked you,"What color is the sky?"I expect that you would answer,"Blue."I am afraid that you would be wrong.The sky has no color.When we see blue,we are looking at blue sunlight.The sunlight is shining on little bits of dust in the air.
We know that there is air all around the world.We could not breathe without air.Airplanes could not fly without air.They need air to lift their wings.Airplanes cannot fly very high because as they go higher the air gets thinner.If we go far enough away from the earth,we find there is no air.
What is the sky?The sky is space.In this space there is nothing except the sun,the moon and all the stars. Scientists have always wanted to know more about the other worlds in the space.They have looked at them through telescopes and in this way they have found out a great deal.The moon is about 384 ,000 kilometers away from the earth.An airplane cann't fly to the moon but there is a thing that can fly even when there is no air. This is rocket.
I am sure that you are asking,"How does a rocket fly?"If you want to know,get a balloon and then blow it up until it is quite big.Do not tie up the neck of the balloon.Let go!The balloon will fly off through the air very quickly.The air inside the balloon tries to get out.It rushes out through the neck of the balloon and this pushes the balloon through the air.It does not need wings like an airplane.
This is how a rocket works.It is not made of rubber（橡胶）like a balloon,of course.It is made of metal. The metal must not be heavy but it must be very strong.There is gas inside the rocket which is made very hot. When it rushes out of the end of the rocket,the rocket is pushed up into the air.
Rockets can fly far out into space.Rockets with men inside them have already reached the moon.Several rockets,without men inside them,have been sent to other worlds much farther away.One day rockets may be able to go anywhere in the space.When an airplane flies too high,______.
A:the air will be too thin to support its wings
B:the air will become thicker
C:the air will exert pressure on it
D:the air will disappear in no time答案：A解析：根据第一段第四句可知，天空没有颜色。
根据第二段第五句“Airplanes cannot fly very high because as they go higher the air gets thinner.”可知，由于位置越高，空气越稀薄，飞机飞不了太高。
根据第五段可知，火箭飞行的原理与没扎口的膨胀的气球相似。
根据第六段最后一句“When it rushes out of the end of the rocket , the rocket is pushed upinto the air.”可知，火箭是由热气流高速向后喷出所产生的反作用力来推动的，而不是由内部燃烧的气体推动的。
根据第六段最后一句可知，当热气从火箭尾部冲出时，火箭被送人空中。C项中的“itsbottom”是第六段最后一句中的“the end of the rocket”的同义转换。 -
第6题：
共用题干
The Smog（烟雾）
For over a month,lndonesia was in crisis.Forest fires raged out of control as the
country suffered its worst drought for 50 years.Smoke from the fires mixed with sunlight and
hot dry air to form a cloud of smog.This pollution quickly spread and within days it was
hanging over neighbouring countries including Malaysia,Singapore and Thailand.
When the smoke combined with pollution from factories and cars,it soon became
poisonous（有毒的）.Dangerous amounts of CO became trapped under the smog and
pollution levels rose. People wheezed（喘息）and coughed as they left the house and their
eyes watered immediately.
The smog made it impossible to see across streets and whole cities disappeared as
grey soot（烟灰）covered everything. In some areas, water was hosed（用胶管浇）from
high-rise city buildings to try and break up the smog.
Finally,heavy rains,which came in November,put out the fires and cleared the air.
But the environmental costs and health problems will remain.Many people from South-
Eastern Asian cities already suffer from breathing huge amounts of car exhaust fumes（汽车
排放的废气）and factory pollution. Breathing problems could well increase and many non-
sufferers may have difficulties for the first time.Wildlife has suffered too.In lowland forests,elephants,deer,and tigers have been driven out of their homes by smog.
But smog is not just an Asian problem.In fact,the word was first used in London in
1905 to describe the mixture of smoke and thick fog.Fog often hung over the capital.
Sometimes the smog was so thick and poisonous that people were killed by breathing
problems or in accidents.About 4, 000 Londoners died within five days as a result of thick
smog in 1952.Indonesia was in crisis because of the drought.
A:Right
B:Wrong
C:Not mentioned答案：A解析： -
第7题：
When a repeating timer expires,（）.
- A、The When-Timer-Expired trigger resets the timer's iteration parameter.
- B、The When-Custom-Item-Event trigger fires and executes the desired actions.
- C、It is put in a queue of expired timers for processing on a first-in-first-out basis.
- D、The When-Timer-Expired trigger fires instantly regardless of any other processing in the form module.
正确答案:C -
第8题：
单选题What is an advantage of using foam in fire fighting?（）AIt is MOST effective on very hot oil fires where the temperatures of the liquid exceed 100°C (212°F)
BMost foams can be used with dry chemicals to attack a fire by two methods
CFoam is effective on combustible metal fires
DFoam can be made with seawater or fresh water
正确答案： B解析： 暂无解析 -
第9题：
问答题Practice 1 Heat loss by sweating depends on the fact that when a liquid evaporates, it absorbs an enormous quantity of heat from its surroundings. Therefore, when I am of sweat evaporate, a great deal of heat is absorbed from the surface of the body in contact with it. 1______ 2______ The first is the amount of movement of air surrounding the body. The second is the amount of water vapor in the air that surrounds the body. 3______ For this reason, sweat evaporates very rapidly on windy days, and the rate of heat loss by sweating is much more than on a still day. This accounts for the fact that hot still days are much less comfortable than hot windy days. In contrast, the sweat evaporates very rapidly on hot windy days, and cools the body quickly and effectively. 4______ When air is carrying the maximum amount of water vapor that it can hold, it is said to be 100% saturated with water vapor. The relative humidity of the air is said to be 100%. Under these conditions the air cannot carry any water, so no water can evaporate. When the relative humidity is high, therefore, sweat cannot evaporate. Instead, it forms large drops and runs off your skin without cooling you. 5______ It is obvious that under these conditions, evaporation will be much more rapid. Therefore, sweating will be much more effective as a method of losing heat from the body. On a hot dry day, sweat evaporates as soon as it is formed, and you feel reasonably cool even though the temperature of your environment is very high.[A] When the air is very dry and carries no water at all, the relative humidity is said to be 0%.[B] The second factor is the amount of water vapor in the air－the humidity.[C] Hot windy days are much more comfortable than hot still days.[D] This heat transfer occurs even if the environment is hotter than the body.[E] When air moves over the surface of water, the amount of evaporation is greatly increased.[F] You might expect the highest incidence of a heat stroke when the maximum temperature is 100 and humidity is 50%.[G] Two factors affect the rate of evaporation of sweat, and therefore the effectiveness of sweating as a method of cooling the body.正确答案： 1.D 空前说“出汗能散热是因为液体蒸发的时候可以带走周围大量的热量。所以当我出汗时,大量的热量被从身体表面吸走了”。D项说“即使周围温度笔体温高时,热量传递也是可以进行的”。符合逻辑关系。故选D。
2.G 根据关键词“the first,the second”可知,本段讲的是两大因素。G项说“影响汗水蒸发的因素有两个”。符合逻辑关系。故选G。
3.E 本段讲的是空气流动情况下汗水的蒸发状况。E项说“当空气在水的表面流动时,蒸发量大为增加”。符合文意。故选E。
4.B 本段讲的是湿度对蒸发的影响。故选B。
5.A 倒数第二段说“当湿度是100%时,蒸发就不能进行了”。最后一段说“在这种情况下,蒸发速度很快”。说明空处讲的是湿度很低的情况。故选A。解析： 暂无解析 -
第10题：
单选题Fires in escaping flammable gas are quickly brought under control by（）Astopping the flow of gas
Breducing the chemical chain reaction
Cincreasing the oxygen supply
Dcooling below the autoignition point
正确答案： C解析： 暂无解析 -
第11题：
单选题What is the main idea of Paragraph 4?AFires are serious threats to human beings.
BAustralian firefighters don‘t put out fires.
CFires can play an important role I forests.
DIt‘s difficult for firefighters to control the fires.
正确答案： A解析：
主旨大意题。通读第四段可知，该段主要讲森林火灾的好处，在不威胁人们生活的条件下，森林火灾可以烧掉森林里的枯枝败叶，让阳光直射大地，促进新的植被的生长。因此，选择C项。 -
第12题：
单选题Why did Russia have so many fires in one month in 2010?ABecause lightening spread the fire.
BBecause there was much fuel for fires.
CBecause there were not enough firefighters.
DBecause it was unusually hot, dry and windy.
正确答案： A解析：
【文章大意】本文主要分析了造成现在越来越多的地区发生森林火灾的原因，并强调有控制的森林火是有必要的，有助于促进植被的更新。
细节推断题。根据文章第二段倒数第三句“In 2010, Russia had the hottest and driest summer in a century”可知，2010年俄罗斯发生多次火灾的原因是天气炎热，气候干燥，故选择D项。 -
第13题：
One disadvantage of using regular dry chemical（sodium bicarbonate）in firefighting is that ______．
A.It can break down under high heat and emit noxious fumes
B.It will decompose under prolonged storage and lose its effectiveness
C.Fire has been known to flash back over the surface of an oil fire
D.It is ineffective in fighting fires in high-voltage electrical equipment
正确答案：C
-
第14题：
共用题干
The Smog（烟雾）
For over a month,Indonesia was in crisis.Forest fires raged out of control as the
country suffered its worst drought for 50 years.Smoke from the fires mixed with sunlight and
hot dry air to form a cloud of smog.This pollution quickly spread and within days it was
hanging over neighbouring countries including Malaysia,Singapore and Thailand.
When the smoke combined with pollution from factories and cars,it soon became
poisonous（有毒的）.Dangerous amounts of CO became trapped under the smog and
pollution levels rose. People wheezed（喘息）and coughed as they left the house and their
eyes watered immediately.
The smog made it impossible to see across streets and whole cities disappeared as
grey soot（烟灰） covered everything. In some areas, water was hosed（用胶管浇）from
high-rise city buildings to try and break up the smog.
Finally,heavy rains,which came in November,put out the fires and cleared the air.
But the environmental costs and health problems will remain.Many people from South-
Eastern Asian cities already suffer from breathing huge amounts of car exhaust fumes（汽车
排放的废气）and factory pollution. Breathing problems could well increase and many non-
sufferers may have difficulties for the first time.Wildlife has suffered too.In lowland
forests,elephants,deer,and tigers have been driven out of their homes by smog.
But smog is not just an Asian problem.In fact,the word was first used in London in
1 905 to describe the mixture of smoke and thick fog.Fog often hung over the capital.
Sometimes the smog was so thick and poisonous that people were killed by breathing
problems or in accidents.About 4, 000 Londoners died within five days as a result of thick
smog in 1952.The air-pollution index went up to 300 within a few days.
A:Right
B:Wrong
C:Not mentioned答案：C解析： -
第15题：
共用题干
The Smog（烟雾）
For over a month,Indonesia was in crisis.Forest fires raged out of control as the
country suffered its worst drought for 50 years.Smoke from the fires mixed with sunlight and
hot dry air to form a cloud of smog.This pollution quickly spread and within days it was
hanging over neighbouring countries including Malaysia,Singapore and Thailand.
When the smoke combined with pollution from factories and cars,it soon became
poisonous（有毒的）.Dangerous amounts of CO became trapped under the smog and
pollution levels rose. People wheezed（喘息）and coughed as they left the house and their
eyes watered immediately.
The smog made it impossible to see across streets and whole cities disappeared as
grey soot（烟灰） covered everything. In some areas, water was hosed（用胶管浇）from
high-rise city buildings to try and break up the smog.
Finally,heavy rains,which came in November,put out the fires and cleared the air.
But the environmental costs and health problems will remain.Many people from South-
Eastern Asian cities already suffer from breathing huge amounts of car exhaust fumes（汽车
排放的废气）and factory pollution. Breathing problems could well increase and many non-
sufferers may have difficulties for the first time.Wildlife has suffered too.In lowland
forests,elephants,deer,and tigers have been driven out of their homes by smog.
But smog is not just an Asian problem.In fact,the word was first used in London in
1 905 to describe the mixture of smoke and thick fog.Fog often hung over the capital.
Sometimes the smog was so thick and poisonous that people were killed by breathing
problems or in accidents.About 4, 000 Londoners died within five days as a result of thick
smog in 1952.Many Indonesians blamed the government for the drought.
A:Right
B:Wrong
C:Not mentioned答案：C解析： -
第16题：
共用题干
The Smog（烟雾）
For over a month,Indonesia was in crisis.Forest fires raged out of control as the
country suffered its worst drought for 50 years.Smoke from the fires mixed with sunlight and
hot dry air to form a cloud of smog.This pollution quickly spread and within days it was
hanging over neighbouring countries including Malaysia,Singapore and Thailand.
When the smoke combined with pollution from factories and cars,it soon became
poisonous（有毒的）.Dangerous amounts of CO became trapped under the smog and
pollution levels rose. People wheezed（喘息）and coughed as they left the house and their
eyes watered immediately.
The smog made it impossible to see across streets and whole cities disappeared as
grey soot（烟灰） covered everything. In some areas, water was hosed（用胶管浇）from
high-rise city buildings to try and break up the smog.
Finally,heavy rains,which came in November,put out the fires and cleared the air.
But the environmental costs and health problems will remain.Many people from South-
Eastern Asian cities already suffer from breathing huge amounts of car exhaust fumes（汽车
排放的废气）and factory pollution. Breathing problems could well increase and many non-
sufferers may have difficulties for the first time.Wildlife has suffered too.In lowland
forests,elephants,deer,and tigers have been driven out of their homes by smog.
But smog is not just an Asian problem.In fact,the word was first used in London in
1 905 to describe the mixture of smoke and thick fog.Fog often hung over the capital.
Sometimes the smog was so thick and poisonous that people were killed by breathing
problems or in accidents.About 4, 000 Londoners died within five days as a result of thick
smog in 1952.The smog spread to neighbouring countries.
A:Right
B:Wrong
C:Not mentioned答案：A解析： -
第17题：
共用题干
Rockets in the Sky
If someone asked you,"What color is the sky?"I expect that you would answer,"Blue."I am afraid that you would be wrong.The sky has no color.When we see blue,we are looking at blue sunlight.The sunlight is shining on little bits of dust in the air.
We know that there is air all around the world.We could not breathe without air.Airplanes could not fly without air.They need air to lift their wings.Airplanes cannot fly very high because as they go higher the air gets thinner.If we go far enough away from the earth,we find there is no air.
What is the sky?The sky is space.In this space there is nothing except the sun,the moon and all the stars. Scientists have always wanted to know more about the other worlds in the space.They have looked at them through telescopes and in this way they have found out a great deal.The moon is about 384 ,000 kilometers away from the earth.An airplane cann't fly to the moon but there is a thing that can fly even when there is no air. This is rocket.
I am sure that you are asking,"How does a rocket fly?"If you want to know,get a balloon and then blow it up until it is quite big.Do not tie up the neck of the balloon.Let go!The balloon will fly off through the air very quickly.The air inside the balloon tries to get out.It rushes out through the neck of the balloon and this pushes the balloon through the air.It does not need wings like an airplane.
This is how a rocket works.It is not made of rubber（橡胶）like a balloon,of course.It is made of metal. The metal must not be heavy but it must be very strong.There is gas inside the rocket which is made very hot. When it rushes out of the end of the rocket,the rocket is pushed up into the air.
Rockets can fly far out into space.Rockets with men inside them have already reached the moon.Several rockets,without men inside them,have been sent to other worlds much farther away.One day rockets may be able to go anywhere in the space.A rocket is pushed up into the air when.
A:hot gas rushes out of its head
B:it is powered by gas
C:hot gas rushes out of its bottom
D:hot gas rushes out of its neck答案：C解析：根据第一段第四句可知，天空没有颜色。
根据第二段第五句“Airplanes cannot fly very high because as they go higher the air gets thinner.”可知，由于位置越高，空气越稀薄，飞机飞不了太高。
根据第五段可知，火箭飞行的原理与没扎口的膨胀的气球相似。
根据第六段最后一句“When it rushes out of the end of the rocket , the rocket is pushed upinto the air.”可知，火箭是由热气流高速向后喷出所产生的反作用力来推动的，而不是由内部燃烧的气体推动的。
根据第六段最后一句可知，当热气从火箭尾部冲出时，火箭被送人空中。C项中的“itsbottom”是第六段最后一句中的“the end of the rocket”的同义转换。 -
第18题：
共用题干
The Smog（烟雾）
For over a month,lndonesia was in crisis.Forest fires raged out of control as the
country suffered its worst drought for 50 years.Smoke from the fires mixed with sunlight and
hot dry air to form a cloud of smog.This pollution quickly spread and within days it was
hanging over neighbouring countries including Malaysia,Singapore and Thailand.
When the smoke combined with pollution from factories and cars,it soon became
poisonous（有毒的）.Dangerous amounts of CO became trapped under the smog and
pollution levels rose. People wheezed（喘息）and coughed as they left the house and their
eyes watered immediately.
The smog made it impossible to see across streets and whole cities disappeared as
grey soot（烟灰）covered everything. In some areas, water was hosed（用胶管浇）from
high-rise city buildings to try and break up the smog.
Finally,heavy rains,which came in November,put out the fires and cleared the air.
But the environmental costs and health problems will remain.Many people from South-
Eastern Asian cities already suffer from breathing huge amounts of car exhaust fumes（汽车
排放的废气）and factory pollution. Breathing problems could well increase and many non-
sufferers may have difficulties for the first time.Wildlife has suffered too.In lowland forests,elephants,deer,and tigers have been driven out of their homes by smog.
But smog is not just an Asian problem.In fact,the word was first used in London in
1905 to describe the mixture of smoke and thick fog.Fog often hung over the capital.
Sometimes the smog was so thick and poisonous that people were killed by breathing
problems or in accidents.About 4, 000 Londoners died within five days as a result of thick
smog in 1952.The air-pollution index went up to 300 within a few days.
A:Right
B:Wrong
C:Not mentioned答案：C解析： -
第19题：
单选题Dry chemical extinguishers extinguish class B fires to the greatest extent by（）.Acooling
Bsmothering
Coxygen dilution
Dbreaking the chain reaction
正确答案： B解析： 暂无解析 -
第20题：
单选题Which of the following is true according to the passage?ANot all the fires in the forests must be put out.
BPeople‘s carelessness leads to dangerous fires.
CAustralia allows all the fires to burn naturally.
DThere are more fires in Russia than in the USA.
正确答案： A解析：
分析判断题。本文重点强调森林火灾的好处，一定的火灾是有必要的。A项说不必扑灭所有的森林火灾，符合文章的观点。B选项指出是人们的大意导致了严重的火灾，根据文章第二、三段的首句可知，引起火灾的原因是气候变化和传统消防，排除B项。根据文章第三段第二句“as result, countries like Australia allow more fires to burn naturally”可知，C项错误。D选项文章没有提及，所以排除。故选择A项。 -
第21题：
单选题The city suffered the worst US air _____ since 1979.Aevent
Bdisease
Cdisaster
Ddamage
正确答案： C解析：
句意：这个城市遭受了自1979年来美国最严重的空难。disaster意为“灾难，灾祸”；event意为“事件”；disease意为“疾病”；damage意为“损害，伤害”。 -
第22题：
单选题When a repeating timer expires,（）.AThe When-Timer-Expired trigger resets the timer's iteration parameter.
BThe When-Custom-Item-Event trigger fires and executes the desired actions.
CIt is put in a queue of expired timers for processing on a first-in-first-out basis.
DThe When-Timer-Expired trigger fires instantly regardless of any other processing in the form module.
正确答案： B解析： 暂无解析 -
第23题：
单选题Steam smoke will occur when（）.AExtremely cold air from shore passes over warmer water
BWarm dry air from shore passes over cooler water
CCold ocean water evaporates into warm air
DCool rain passes through a warm air mass
正确答案： B解析： 暂无解析