was designed many years ago，with a goal in mind：transmitting the human voice in a more-or-less recognizable form．A．DWDMB．PSTNC．internetD．WLAN
题目
was designed many years ago，with a goal in mind：transmitting the human voice in a more-or-less recognizable form．
A．DWDM
B．PSTN
C．internet
D．WLAN
相似考题
更多“was designed many years ago,with a goal in mind:transmitting the human voice in a more ”相关问题
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第1题：
We may conclude from the text that .
［A］ human cloning will not succeed unless the technique is more efficient
［B］ scientists are optimistic about cloning technique
［C］ many people are against the idea of human cloning
［D］ cloned animals are more favored by owners even if they are weaker
正确答案：A细节题。文章一开始就引用专家威斯苏森的话，指出克隆人是愚蠢的尝试。第二段最后两句提到，克隆实验的低效性和危险性在克隆人中不可接受。文章末尾再次引用该专家的话，指出现在动物的克隆研究还没完全成功，没有必要想到克隆人。由此可见，技术是克隆实验存在的主要问题，也是阻碍克隆人实验的重要原因，因此可推知［A］ 正确。［B］ 明显错误，科学家并不乐观。全文只涉及专家和拥护克隆实验的人的观点，因此无法推知［C］ 中的“许多人”。［D］ 在文中没有提及。 -
第2题：
完形填空Many of the world’s pollution problems have been caused by the crowding of large groups of people into cities.Satisfying the 21 of the people leads to further polluting by industry.If the rapid increase in human population 22 at the present rate (比率), there may be much greater harm.Some scientists speak of the 23 in number of people as “Population Pollution”.
About 2000 years ago, the world 24 was probably about 250 million.It reached a billion in 1850.By 1930 the population was two billion.It is 25 three and a half billion.It is expected to double by the year 2000.If the population continues to grow at the same 26 , there would be 25 billion people in the world a hundred years from now.
Man has been using the earth’s 27 more and more rapidly over the years.Some of them are almost gone.Now many people believe that man’s greatest 28 is how to control the growth of this population.The materials in the world will not support the human population in time to come if the present rate of increase continues.29 there is over crowding in the cities and hunger in some countries.Can man’s rate of increase continue?
Many people believe that human survival (幸存者) in the future 30 on the answer to the question.
21.A.needs
B.supplies
C.service
D.supports
22.A.stops
B.continues
C.slows down
D.adds to
23.A.increase
B.reduce
C.country
D.improvement
24.A.people
B.situation
C.population
D.land
25.A.now
B.in the past
C.in the future
D.then
26.A.place
B.time
C.rate
D.result
27.A coal
B.oil
C.mines
D.resources
28.A.problem
B.power
C.plan
D.idea
29.A.Already
B.Yet
C.Still
D.Often
30.A.feeds
B.lives
C.keeps
D.depends
参考答案：BACAC DAAD
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第3题：
Compared with parents of 30 years ago, today's parents ( )．
A． go to clubs more often with their children
B． are much stricter with their children
C． care less about．their children's life
D． give their children more freedom
正确答案：D
D[解析]根据第三段第一句So it seems that this generation of parents is much more likely than parents of 30 years ago to treat their children as friends.及其后的例子可知 D项正确。 -
第4题：
共用题干
Older Volcanic Eruptions
Volcanoes were more destructive in ancient history,not because they were bigger,but because the carbon dioxide they released wiped out life with greater ease.
Paul Wignall from the University of Leeds was investigating the link between volcanic eruptions and mass extinctions.Not all volcanic eruptions killed off large numbers of animals,but all the mass extinctions over the past 300 million years coincided with huge formations of volcanic rock.To his surprise,the older the massive.volcanic eruptions were,the more damage they seemed to do.He calculated the"killing efficiency" for these volcanoes by comparing the proportion of life they killed off with the volume of lava（熔岩）that they produced.He found that size for size,older eruptions were at least 10 times as effective at wiping out life as their more recent rivals.
The Permian（二叠纪）extinction,for example,which happened 250 million years ago,is marked by floods of volcanic rock in Siberia that cover an area roughly the size of western Europe.Those volcanoes are thought to have pumped out about 1 0 gigatonnes（十亿吨）of carbon as carbon dioxide.The global warming that followed wiped out 80 percent of all marine genera（种类）at the time,and it took 5 million years for the planet to recover.Yet 60 million years ago,there was another huge amount of volcanic activity and global warming but no mass extinction.Some animals did disappear but things returned to normal within ten thousands of years."The most recent ones hardly have an effect at all,"Wignall says.He ignored the extinction which wiped out the dinosaurs 65 million years ago,because many scientists believe it was primarily caused by the impact of an asteroid（小行星）.He thinks that older volcanoes had more killing power because more recent life forms were better adapted to dealing with increased levels of CO2.
Vincent Courtillot,director of the Paris Geophysical InstitUte in France,says that Wignall's idea is provoca- tive.But he says it is incredibly hard to do these sorts of calculations.He points out that the killing power of volcanic eruptions depends on how long they lasted.And it is impossible to tell whether the huge blasts lasted for thousands or millions of years.He also adds that it is difficult to estimate how much lava prehistoric volcanoes produced,and that lava volume may not necessarily correspond to carbon dioxide emissions.Permian extinction occurred______.
A:300 million years ago
B:250 million years ago
C:60 million years ago
D:65 million years ago答案：B解析：由第三段最后一句可知，Wignall认为远古火山之所以更具有杀伤力，是因为近期的生物能更好地适应二氧化碳含量的上升。
根据第二段第四句可知，“杀伤效率”是通过比较火山释放出的熔岩的体积与杀死生命的比例计算得出的。
根据第三段第一句可知，二叠纪物种灭绝发生在两亿五千万年以前。
根据第三段第三句可知，二叠纪后的全球变暖毁灭了80%的海洋生物，因此只有20%的海洋生物在这场劫难中生还，所以A项表述错误。
最后一段表明了Vincent Courtillot的观点，根据最后一段第一句可知，他认为Wignall的观点具有争议性，因此他对Wignall的观点是持否定态度的。provocative挑衅的，煽动性的，激起争端的。 -
第5题：
Years ago,a cigarette commercial asked if you were smoking more,but enjoying it less．That describes the way many of us live today．We are doing more,but enjoying it less．And when that doesn't work,we get the problem．In our extremely hurried search for satisfaction,we try stuffing still more into our days,never realizing that we are taking the wrong approach.
The truth is simple;so simple it is hard to believe．Satisfaction lies with less,not with more．Yet,we pursue the myth that this thing,or that activity,will somehow provide the satisfaction we so desperately seek.
Arthur Lindman,in his very effective book,"The Harried Leisure Class,"described the uselessness of pursuing more．His research focused on what people did with their leisure time．He found that as income rose,people bought more things to occupy their leisure time．But,ironically,the more things they bought,the less they valued any one of them．Carried to an extreme,he predicted massive boredom in the midst of tremendous variety．That was more than twenty years ago,and his prediction seems more accurate every year.
Lindman of course,is not the first to discover this．The writer of Ecclesiastes expressed the same thought thousands of years ago．It is better,he wrote,to have less,but enjoy it more.
If you would like to enjoy life more,I challenge you to experiment with me．How could you simplify your life?What could you drop?What could you do without?What could you stop pursuing?What few things could you concentrate on?
The more I learn,the more I realize that fullness of life does not depend on things．The more I give up,the more I seem to gain．But words will never convince you．You must try it for yourself．
Lindman wrote his book__.A.ten years ago
B.twenty years ago
C.more than twenty years ago
D.thousands of years ago答案：C解析：第三段最后。Arthur Lind man预言，巨大的无聊存在于极度的丰富之中。而这还是20多年前的预言，并且，他的预言越来越准确。选项D是第四段中另一本书的时间。 -
第6题：
Our factory is much more productive now. This year’s production is five times as much （） it was ten years ago.
Awhat
Bas
Cthat
Dthan
B
略 -
第7题：
What two descriptions best define DWDM？ （）
- A、 a WDM system that is compatible with EDFA technology
- B、 an optical technology for transmitting up to 16 channels over multiple fiber strands
- C、 an optical technology for transmitting up to 32 channels over multiple fiber strands
- D、 a technology for transmitting multiple optical signals using less sophisticated transceiver designthen CWDM
- E、 a technology for transmitting more closely packed optical signals using more sophisticatedtransceiver designs than CWDM
正确答案:A,E -
第8题：
How many years of experience do you have with deploying and maintaining a virtualization infrastructure using any desktop or server virtualization technologies?（）
- A、I have not done this yet.
- B、Less than 6 months
- C、More than 6 months but less than 1 year
- D、1 - 2 years
- E、2 - 3 years
- F、More than 3 years
正确答案:A -
第9题：
单选题The author of Passage 1 states that the human body is more like a garbage dump than a watch (lines 8－9) to emphasize that ______.Athe parts of the human body don't always work together seamlessly to keep us alive and functioning
Bthe human body cannot be counted on to work flawlessly, while watches rarely fail
Cscientists can never tell ahead of time which experiments will work and which will not
Dthe human body exists in its present state due to a long evolutionary process that began more than 500 million years ago
Ethe human body contains many useless renmants left over from the evolutionary process
正确答案： D解析：
作者提出与大家普遍认为的不同，在我们人体内存在很多剩余的垃圾，故选E项。 -
第10题：
单选题More than two hundred years ago the United States _____ from the British Empire and became an independent country.Agot off
Bpulled down
Cbroke away
Ddropped off
正确答案： D解析：
句意：两百多年以前，美国脱离了大英帝国成为一个独立的国家。break away脱离；放弃。get off下车；动身，出发。pull down推翻，摧毁。drop off睡着；下降。 -
第11题：
单选题Electricity （） by the Greeks a good many years ago.Awas first found
Bwas first discovered
Chas first been discovered
Dwas seen first
正确答案： B解析： 暂无解析 -
第12题：
单选题For many years marine centrifuges were designed for （） operation, that is the machines were run for a period during which solids accumulated in the bowlThe machine was stopped when the accumulated solids began to impair its performance.Apurifying
Bbatch
Clong period
Dtemporary
正确答案： B解析： 暂无解析 -
第13题：
I wonder how many years ago _______.
A.did you father retire
B.your father retired
C.has your father retired
D.your father has retired
参考答案：B
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第14题：
I started my teaching career at the school. That was more than twenty years ago, and I _____ there ever since.
A. was
B. had been
C. will be
D. have been
参考答案： D
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第15题：
Edison invented the light bulb many years ago（改为被动语态）
The light bulb__________ __________by Edison many years ago．
正确答案：
38. was invented -
第16题：
Compared with parents of 30 years ago，today’s parents__________．A.go to clubs more often with their children
B.are much stricter with their children
C.care less about their children’s life
D.give their children more freedom答案：D解析：根据第三段第一句“So it seems that this generation ofparents is much more likely than par-ents of 30 vears ago to treat their children as friends．”和Susan Crome的描述“Looking back on the last lo years，there was a lot ofwhat you could call negotiation．”可知这一代的父母比起30年前上一代的父母更善于把孩子当成朋友看待，Susan说有很多事情都可以和她父母商量，也就是说这一代父母给孩子更多自由。 -
第17题：
共用题干
Older Volcanic Eruptions
Volcanoes were more destructive in ancient history,not because they were bigger,but because the carbon dioxide they released wiped out life with greater ease.
Paul Wignall from the University of Leeds was investigating the link between volcanic eruptions and mass extinctions.Not all volcanic eruptions killed off large numbers of animals,but all the mass extinctions over the past 300 million years coincided with huge formations of volcanic rock.To his surprise,the older the massive volcanic eruptions were,the more damage they seemed to do.He calculated the"killing efficiency" for these volcanoes by comparing the proportion of life they killed off with the volume of lava（熔岩）that they produced.He found that size for size,older eruptions were at least 10 times as effective at wiping out life as their more recent rivals.
The Permian（二叠纪）extinction,for example,which happened 250 million years ago,is marked by floods of volcanic rock in Siberia that cover an area roughly the size of western Europe.Those volcanoes are thought to have pumped out about 10 gigatonnes of carbon as carbon dioxide.The global warming that followed wiped out 80 percent of all marine genera（种类）at the time,and it took 5 million years for the planet to recover.Yet 60 million years ago,there was another huge amount of volcanic activity and global warming but no mass extinction.Some animals did disappear but things returned to normal within ten thousand of years."The most recent ones hardly
have an effect at all,"Wignall says.He ignored the extinction which wiped out the dinosaurs 65 million years ago,because many scientists believe it was primarily caused by the impact of an asteroid（小行星）.He thinks that older volcanoes had more killing power because more recent life forms were better adapted to dealing with increased levels of CO2．
Vincent Courtill.ot,director of the Paris Geophysical Institute in France,says that Wignall's idea is provocative.But he says it is incredibly hard to do these sorts of calculations.He points out that the killing power of volcanic eruptions depends on how long they lasted.And it is impossible to tell whether the huge blasts lasted for tliousands or millions of years.He also adds that it is difficult to estimate how much lava prehistoric volcanoes produced,and that lava volume may not necessarily correspond to carbon dioxide emissions。When did dinosaurs become extinct?
A:300 million years ago.
B:250 milliOn years ago.
C:60 million years ago.
D:65 million years ago.答案：D解析：由文章第一段可知，远古火山喷发更具破坏力，不是因为它们规模更大，而是因为它们释放出的二氧化碳更容易毁灭生命。故选A。
由文章第二段第四句话“He calculated the ‘ killing efficiency ' for those… they are produced.”可知，Wignall通过比较火山释放的熔岩的体积与杀死生命的比例计算这些火山的杀伤力。故选D0
由文章第三段倒数第二句话“He ignored the extinction which wiped out the dinosaurs 65 million years ago …”可知，恐龙是在6500万年前灭绝的。故选D。
由文章第三段倒数第二句话“… because many scientists believe it was primarily caused by the impact of an asteroid.”可知，Wignall没有提6500万年前恐龙的灭绝是否跟火山爆发有关是因为许多科学家认为恐龙的灭绝是由一颗小行星的影响造成的。由此可推断出关于恐龙灭绝的原因在科学家之间是有分歧的。故选D。
文章第一段直接点明了文章的主要论点。" Volcanoes were more destructive in ancient history..."（古代火山喷发更具破坏力）。故选B。 -
第18题：
Electricity （） by the Greeks a good many years ago.
Awas first found
Bwas first discovered
Chas first been discovered
Dwas seen first
B
略 -
第19题：
How many years of experience do you have using any version of Windows Server? （）
- A、I have not done this yet.
- B、Less than 6 months
- C、More than 6 months but less than 1 year
- D、1-2 years
- E、2-3 years
- F、More than 3 years
正确答案:A -
第20题：
单选题I wonder how many years ago _____.Adid your father retire
Byour father retired
Chas your father retired
Dyour father has retired
正确答案： A解析：
宾语从句中用陈述语序。排除A、C。时间状语（how many years ago）提示要用过去时，故为B。 -
第21题：
单选题There would be many more organ donors if ______.Alaws are designed to encourage organ recycling
Bonly a few people become organ donors
Cdoctors are more willing to ask for donations
Dtransplant surgery is more successful
正确答案： D解析：
分析推理题。由第三段最后一句可知，专家指出最大的障碍是医生没有要求捐赠。即专家们认为，如果医生更多地要求捐赠，那么那些意外死亡的人可能就会捐赠出器官，从而使得可用器官增加。故C项为正确答案。 -
第22题：
多选题What two descriptions best define DWDM？ （）Aa WDM system that is compatible with EDFA technology
Ban optical technology for transmitting up to 16 channels over multiple fiber strands
Can optical technology for transmitting up to 32 channels over multiple fiber strands
Da technology for transmitting multiple optical signals using less sophisticated transceiver designthen CWDM
Ea technology for transmitting more closely packed optical signals using more sophisticatedtransceiver designs than CWDM
正确答案： D,A解析： 暂无解析 -
第23题：
单选题Our factory is much more productive now. This year’s production is five times as much （） it was ten years ago.Awhat
Bas
Cthat
Dthan
正确答案： B解析： 暂无解析