单选题The population of peregrine falcons declined rapidly during the 1950’s and 1960’s and reached an all-time low in the early 1970’s. The decline was attributed by scientists to the widespread use of the pesticide DDT in rural areas. Which of the followi
题目
DDT was not generally in use in areas devoted to heavy industry.
In the time since the use of DDT was banned in 1972, the population of peregrine falcons has been steadily increasing.
Peregrine falcons, like other birds of prey, abandon eggs that have fallen out of the nest, even if the eggs remain intact.
Starlings, house sparrows, and blue jays-birds the peregrine falcon preys on were not adversely affected by DDT in their habitats.
Other birds of prey, such as the osprey, the bald eagle, and the brown pelican, are found in the same areas as is the peregrine falcon.
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更多“单选题The population of peregrine falcons declined rapidly during the 1950’s and 1960’s and reached an all-time low in the early 1970’s. The decline was attributed by scientists to the widespread use of the pesticide DDT in rural areas. Which of the followi”相关问题
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第1题：
光固化复合树脂问世于()。A、1940s
B、1950s
C、1970s
D、1960s
答案：C
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第2题：
Today ,as in every other day of the year ,more than 3000 U.S. adlescents will smoke their first cigarette on their way to becoming regular smokers as adults. During their lifetime,it can be expected that of these 3000 about 23 will be murdered,30 will die in traffic accidents, and nearly 750 will be killed by a smoking-related disease. The number of deaths attributed to cigarette smoking outweithts all other factors, whether voluntary or involuntary, as a cause of death.
Since the late 1970s, when daily smoking among high school seniors reached 30 precent , smoking rates among youth have declined . While the decline is impressive ,several important issues must be raised.
First, in the past several years,smoking rates among youth have declined very little. Second,in the late 1970s ,smoking among male high school seniors exceeded that among female by nearly 10 percent . The statistic is reversing.Third ,several recent studies have indicate high school dropouts have excessively high smoking rates, as much as 75 percent .
Finally, thouth significant declines in adolescent smoking have occurred in the past decade,no definite reasons for the decline exist. Within this context,the Naional Cancer Instiute (NCI) began its current effort to determine the most effecive measures to reduce smoking levesl among youth.
According to the author, the deaths among youth are mainly caused by _____.a.traffic accidents
b.smoking-related desease
c.murder
d.all of these答案：B解析： -
第3题：
The first IC’s were made____the early 1960’s.A.in
B.from
C.for
D.of答案：A解析：本题考查介词。题目意为：“第一块集成电路诞生于二十世纪六十年代初期。”
固定搭配in the early 1960’s 二十世纪六十年代初期，指1960到1970年间某时间点。
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第4题：
The economy of Ireland has been traditionally agricultural,but since （）country.sindustrial base has expanded.
Athe mid-1950s
Bthe mid-1960s
Cthe 1970s
Dthe 1980s
A
略 -
第5题：
The population decreased from the 1840s until about 1970,largely because of（）.
- A、a low birth rate
- B、a high death rate
- C、a low employment rate
- D、a high emigration rate
正确答案:D -
第6题：
单选题Since 1960, the fast-growing town of Hotstone, Arizona, has drawn water from the Gray River, which feeds Lake Mudfish. If the town’s water use continues to grow at its present rate, in about 20 years the water level of Lake Mudfish will inevitably decrease to the point that it can no longer support its biologically fragile population of fish. The prediction above is based on which of the following assumptions?AAs the town’s water requirements grow, it will not be able to meet those requirements by drawing on water sources other than the Gray River.
BSince 1960, the lake’s population of fish has become more biologically fragile.
CThe amount of water that the lake loses to evaporation each year will increase over the next two decades.
DThere are multiple sources of water besides the Gray River that feed into Lake Mudfish.
EThe town of Hotstone will be able to reverse its trend of increasing water use if it implements an aggressive water conservation program.
正确答案： B解析：
由文段的内容可知，Mudfish湖之所以会干涸是因为Gray River的水都被用来提供给周边的Hotstone和Arizona，所以可知本题应选A项。 -
第7题：
单选题The economy of Ireland has been traditionally agricultural,but since （）country.sindustrial base has expanded.Athe mid-1950s
Bthe mid-1960s
Cthe 1970s
Dthe 1980s
正确答案： A解析： 暂无解析 -
第8题：
单选题The population decreased from the 1840s until about 1970,largely because of（）.Aa low birth rate
Ba high death rate
Ca low employment rate
Da high emigration rate
正确答案： D解析： 暂无解析 -
第9题：
单选题The expression “fared best” in the sentence “During the 1960s and 1970s, and again after 1992, the poorest groups fared best.” in para. 8 can be paraphrased by which of the following?Aobtained higher income
Blived a better life
Cenjoyed more equality
Dpaid lower income tax
正确答案： A解析：
题目问的是：第8段中的句子“在20世纪60年代到70年代期间，还有1992年以后的时期，最穷的群体进展最好”，里面的“fared best”可以用下列哪一项释义？从文中可知，这两段时期里贫富差距有所缩小，即使是穷人也过上了好日子，选项B意思相近。故选B。 -
第10题：
单选题Today ,as in every other day of the year ,more than 3000 U.S. adlescents will smoke their first cigarette on their way to becoming regular smokers as adults. During their lifetime,it can be expected that of these 3000 about 23 will be murdered,30 will die in traffic accidents, and nearly 750 will be killed by a smoking-related disease. The number of deaths attributed to cigarette smoking outweithts all other factors, whether voluntary or involuntary, as a cause of death. Since the late 1970s, when daily smoking among high school seniors reached 30 precent , smoking rates among youth have declined . While the decline is impressive ,several important issues must be raised. First, in the past several years,smoking rates among youth have declined very little. Second,in the late 1970s ,smoking among male high school seniors exceeded that among female by nearly 10 percent . The statistic is reversing.Third ,several recent studies have indicate high school dropouts have excessively high smoking rates, as much as 75 percent . Finally, thouth significant declines in adolescent smoking have occurred in the past decade,no definite reasons for the decline exist. Within this context,the Naional Cancer Instiute (NCI) began its current effort to determine the most effecive measures to reduce smoking levesl among youth. The reason for declining adolescent smoking is that （）.ANCI has taken effective measures
Bsmoking is prevented among high school seniors
Cthere are many smokers who have died of cancer
Dnone of these
正确答案： A解析： 暂无解析 -
第11题：
单选题An example of a product which might well has been advertised during the early stages of the Industrial Revolution is _____.Aa cooking utensil
Bnew child’s toy
Ctinned fruit
Dhousehold soap
正确答案： C解析：
由Excerpt 2可知，在工业革命初期，广告主要用来推销新奇产品和边缘产品，而不包括后来通过加工而成的产品。故B项为正确答案。 -
第12题：
单选题The population of peregrine falcons declined rapidly during the 1950’s and 1960’s and reached an all-time low in the early 1970’s. The decline was attributed by scientists to the widespread use of the pesticide DDT in rural areas. Which of the following, if true, gives the strongest support to the scientists’ claim?ADDT was not generally in use in areas devoted to heavy industry.
BIn the time since the use of DDT was banned in 1972, the population of peregrine falcons has been steadily increasing.
CPeregrine falcons, like other birds of prey, abandon eggs that have fallen out of the nest, even if the eggs remain intact.
DStarlings, house sparrows, and blue jays-birds the peregrine falcon preys on were not adversely affected by DDT in their habitats.
EOther birds of prey, such as the osprey, the bald eagle, and the brown pelican, are found in the same areas as is the peregrine falcon.
正确答案： D解析：
文段由“游隼数量下降”这一事实，得出结论“DDT是游隼数量下降原因”，如果DDT被禁用以后，游隼数量稳步增加的话，那么从反面支持了科学家的结论，故B是正确的。 -
第13题：
in the 1950s and 1960s many australian writers thought that to gain a name they had to leave australia，and most went overseas to the u.s. ()
参考答案：错误
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第14题：
Today ,as in every other day of the year ,more than 3000 U.S. adlescents will smoke their first cigarette on their way to becoming regular smokers as adults. During their lifetime,it can be expected that of these 3000 about 23 will be murdered,30 will die in traffic accidents, and nearly 750 will be killed by a smoking-related disease. The number of deaths attributed to cigarette smoking outweithts all other factors, whether voluntary or involuntary, as a cause of death.
Since the late 1970s, when daily smoking among high school seniors reached 30 precent , smoking rates among youth have declined . While the decline is impressive ,several important issues must be raised.
First, in the past several years,smoking rates among youth have declined very little. Second,in the late 1970s ,smoking among male high school seniors exceeded that among female by nearly 10 percent . The statistic is reversing.Third ,several recent studies have indicate high school dropouts have excessively high smoking rates, as much as 75 percent .
Finally, thouth significant declines in adolescent smoking have occurred in the past decade,no definite reasons for the decline exist. Within this context,the Naional Cancer Instiute (NCI) began its current effort to determine the most effecive measures to reduce smoking levesl among youth.
What is implied but not stated by the author is that ________.
a.smoking rates among youth have declined very little
b.there are now more female than male smokers among high school seniors
c.high smoking rates are due to the incease in wealth
d.smoking at high school are from low socio-economic backgrounds答案：B解析： -
第15题：
The economic policy Britain pursued in the 1950s and 1960s was based on the theory of（）
AAdam Smith
BJohn Maynard Keynes
CMargaret Thatcher
DKarl Marx
B
略 -
第16题：
The population decreased from the 1840s until about 1970,largely because of（）.
Aa low birth rate
Ba high death rate
Ca low employment rate
Da high emigration rate
D
略 -
第17题：
The economy of Ireland has been traditionally agricultural,but since （）country.sindustrial base has expanded.
- A、the mid-1950s
- B、the mid-1960s
- C、the 1970s
- D、the 1980s
正确答案:A -
第18题：
单选题Today ,as in every other day of the year ,more than 3000 U.S. adlescents will smoke their first cigarette on their way to becoming regular smokers as adults. During their lifetime,it can be expected that of these 3000 about 23 will be murdered,30 will die in traffic accidents, and nearly 750 will be killed by a smoking-related disease. The number of deaths attributed to cigarette smoking outweithts all other factors, whether voluntary or involuntary, as a cause of death. Since the late 1970s, when daily smoking among high school seniors reached 30 precent , smoking rates among youth have declined . While the decline is impressive ,several important issues must be raised. First, in the past several years,smoking rates among youth have declined very little. Second,in the late 1970s ,smoking among male high school seniors exceeded that among female by nearly 10 percent . The statistic is reversing.Third ,several recent studies have indicate high school dropouts have excessively high smoking rates, as much as 75 percent . Finally, thouth significant declines in adolescent smoking have occurred in the past decade,no definite reasons for the decline exist. Within this context,the Naional Cancer Instiute (NCI) began its current effort to determine the most effecive measures to reduce smoking levesl among youth. What is implied but not stated by the author is that （）.Asmoking rates among youth have declined very little
Bthere are now more female than male smokers among high school seniors
Chigh smoking rates are due to the incease in wealth
Dsmoking at high school are from low socio-economic backgrounds
正确答案： B解析： 暂无解析 -
第19题：
单选题One of the main goals of the modern woman’s liberation movement, which started in the early 1960s, was to _____ sex discrimination in the workforce, and to open up careers for women that were previously reserved for men.Aabolish
Beliminate
Cdiminish
Dextinguish
正确答案： A解析：
句意：发起于20世纪60年代早期的现代妇女解放运动的主要目的之一就是消除对劳动力的性别歧视，而且向妇女们开放那些原来属于男性的工作。妇女运动的一个主要目的应该“消除”性别歧视。eliminate彻底消除，消灭，后面可接某些表示现象、意识形态等的抽象名词，因此B为正确答案。abolish废除，取消，通常指废除或取消某种制度或法律、法规，但性别歧视不是制度或法律条文，而是一种意识形态，所以不能和abolish搭配使用。diminish使变少，变小，表示程度或数量上的减轻或减少。extinguish消失，通常指使火熄灭或使希望、热情等消亡。 -
第20题：
问答题In the early 1950s the researchers who produced the first clad glass optical fibers were not thinking of using them for communications. (1) H____, fiber optics was already a well-established commercial technology when the famous paper by Kao and Hockham, (2)____(claim) the use of low-loss optical fibers for communication, appeared in 1966. The first low-loss silica fiber was described in (3)____ which appeared in October of 1970. The date of this publication is sometimes (4)____(cite) as the beginning of the era of fiber communication. Although this development did receive (5)____(consider) attention in the research community at the time, it was far from inevitable that a major industry would evolve. The technological barriers appeared formidable because there were serious doubts as to (6) wh_____ these fiber components could ever be produced economically enough, but the market potential was very significant. (7)____(consequence), research and development activity expanded rapidly, and a number of important issues were (8) re_____ during the early 1970s. During the middle and late 1970s，the rate of progress towards marketable products accelerated as the emphasis (9)____(shift) from research to engineering. Fibers with losses (10) app____ the Rayleigh limit of 2 dB/km at a wavelength of 0.8μm were produced. By 1980 improvement in component performance, cost, and reliability led to major commitments on the part of telephone companies.正确答案：
1.However 此处句意发生转折。此句译为:50年代初期,那些生产出第一批被覆层玻璃光纤的研究者们尚未考虑将光纤应用到通信中。然而,当1966年Kao和Hockham发表著名论文,提出把低耗光纤应用于通讯中时,纤维光学已经成为一个相当成熟的商业技术了。
2.claiming 现在分词作后置定语。
3.publication 从下句的this publication可知答案为publication。
4.cited 此处为被动语态。句意为:这篇文章发表的日期经常被人们称为光纤通讯时代的起始日。
5.considerable 此处需要形容词形式修饰名词attention。considerable attention相当多的关注。此句可译为:尽管当时这项技术在研究领域确实引起了极大的关注,但要发展成一个重要产业还相差甚远。
6.whether 此句可译为:该技术障碍似乎难以逾越,因为人们十分怀疑这些纤维构件是否可以以足够低的成本生产出来,但是市场潜力是十分巨大的。
7.Consequently 此句成分完整,用表示因果关系的副词consequently以与上句的联系紧凑。
8.resolved resolve找到解决…的方法,与issues搭配,指一系列问题得到了解决。
9.shifted shift指位置或方向的移动、改变;指由一种形式或用途改变为另一种形式或用途。
10.approaching approaching the Rayleigh limit接近瑞利极限。解析： 暂无解析 -
第21题：
单选题The economic policy Britain pursued in the 1950s and 1960s was based on the theory of（）AAdam Smith
BJohn Maynard Keynes
CMargaret Thatcher
DKarl Marx
正确答案： A解析： 暂无解析 -
第22题：
单选题It was during the 1996's that the friendship between Edward and Jeremy reached their highest point.Aduring
Bthat
Ctheir
Dhighest
正确答案： C解析： -
第23题：
单选题According to Hudson Institute researchers, the effect of the early retirement of qualified workers in the U. S. economy is ______.Aconstructive
Bsignificant
Cinconclusive
Ddetrimental
正确答案： C解析：
推断题。四个词的意思分别是constructive“建设性的，有益的”；significant“重大的，显著的，具有特殊意义的”；inconclusive“无结果的，无说服力的，非决定性的”；detrimental“有害的，伤害的，不利的”。本文讨论的是熟练技工过早退休的不利。所以选D。 -
第24题：
单选题By the year 2020, China's population probably______1.4billion.Awill be reaching
Bare reaching
Cwill have reached
Dhas reached
正确答案： A解析：