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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?A
DDT was not generally in use in areas devoted to heavy industry.B
In the time since the use of DDT was banned in 1972, the population of peregrine falcons has been steadily increasing.C
Peregrine falcons, like other birds of prey, abandon eggs that have fallen out of the nest, even if the eggs remain intact.D
Starlings, house sparrows, and blue jays-birds the peregrine falcon preys on were not adversely affected by DDT in their habitats.E
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 following, if true, gives the strongest support to the scientists’ claim?A DDT was not generally in use in areas devoted to heavy industry.B In the time since the use of DDT was banned in 1972, the population of peregrine falcons has been steadily increasing.C Peregrine falcons, like other birds of prey, abandon eggs that have fallen out of the nest, even if the eggs remain intact.D Starlings, house sparrows, and blue jays-birds the peregrine falcon preys on were not adversely affected by DDT in their habitats.E 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.” 相关考题
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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
考题
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
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The population decreased from the 1840s until about 1970,largely because of（）.Aa low birth rateBa high death rateCa low employment rateDa high emigration rate
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The population decreased from the 1840s until about 1970,largely because of（）.A、a low birth rateB、a high death rateC、a low employment rateD、a high emigration rate
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The economy of Ireland has been traditionally agricultural,but since （）country.sindustrial base has expanded.A、the mid-1950sB、the mid-1960sC、the 1970sD、the 1980s
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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?A
As 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.B
Since 1960, the lake’s population of fish has become more biologically fragile.C
The amount of water that the lake loses to evaporation each year will increase over the next two decades.D
There are multiple sources of water besides the Gray River that feed into Lake Mudfish.E
The town of Hotstone will be able to reverse its trend of increasing water use if it implements an aggressive water conservation program.
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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 （）.A
smoking rates among youth have declined very littleB
there are now more female than male smokers among high school seniorsC
high smoking rates are due to the incease in wealthD
smoking at high school are from low socio-economic backgrounds
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单选题The economy of Ireland has been traditionally agricultural,but since （）country.sindustrial base has expanded.A
the mid-1950sB
the mid-1960sC
the 1970sD
the 1980s
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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.A
abolishB
eliminateC
diminishD
extinguish
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单选题The population decreased from the 1840s until about 1970,largely because of（）.A
a low birth rateB
a high death rateC
a low employment rateD
a high emigration rate
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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.
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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?A
obtained higher incomeB
lived a better lifeC
enjoyed more equalityD
paid lower income tax
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单选题The economic policy Britain pursued in the 1950s and 1960s was based on the theory of（）A
Adam SmithB
John Maynard KeynesC
Margaret ThatcherD
Karl Marx
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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 （）.A
NCI has taken effective measuresB
smoking is prevented among high school seniorsC
there are many smokers who have died of cancerD
none of these
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单选题It was during the 1996's that the friendship between Edward and Jeremy reached their highest point.A
duringB
thatC
theirD
highest
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单选题An example of a product which might well has been advertised during the early stages of the Industrial Revolution is _____.A
a cooking utensilB
new child’s toyC
tinned fruitD
household soap
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单选题According to Hudson Institute researchers, the effect of the early retirement of qualified workers in the U. S. economy is ______.A
constructiveB
significantC
inconclusiveD
detrimental
考题
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?A
DDT was not generally in use in areas devoted to heavy industry.B
In the time since the use of DDT was banned in 1972, the population of peregrine falcons has been steadily increasing.C
Peregrine falcons, like other birds of prey, abandon eggs that have fallen out of the nest, even if the eggs remain intact.D
Starlings, house sparrows, and blue jays-birds the peregrine falcon preys on were not adversely affected by DDT in their habitats.E
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.
考题
单选题By the year 2020, China's population probably______1.4billion.A
will be reachingB
are reachingC
will have reachedD
has reached
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