Over the years, Allan Rechtschaffen has
killed a lot of rats just by keeping them awake.
In his sleep
laboratory at the University of Chicago, Rechtschaffen places each rat on an
enclosed turntable contraption that begins spinning whenever the rodent’s brain
waves suggest it is beginning to nod off-forcing the rodent to keep moving so
that it doesn’t bump into a wall. After about a week of enforced consciousness,
the rat begins showing some signs of strain. Odd lesions break out on its tail
and paws. It becomes irritable. Its body temperature drops even as it attempts
to make itself warmer than usual. It eats twice as much food as normal but loses
10 to 15 percent of its body weight. After about 17 days of sleeplessness, the
rat dies.
What kills it "We don’t know," says
Rechtschaffen.
Thus it goes in the science of sleep. Rats can
last
A. (A) The Sleep Laboratory at the University of Chicago.
B. (B) The Experiment of Rats’ Sleep.
C. (C) What is Sleep for
D. (D) What can Sleeplessness result in
更多"Over the years, Allan Rechtschaffen"的相关试题:
[单项选择]
Over the years, Allan Rechtschaffen has
killed a lot of rats just by keeping them awake.
In his sleep
laboratory at the University of Chicago, Rechtschaffen places each rat on an
enclosed turntable contraption that begins spinning whenever the rodent’s brain
waves suggest it is beginning to nod off-forcing the rodent to keep moving so
that it doesn’t bump into a wall. After about a week of enforced consciousness,
the rat begins showing some signs of strain. Odd lesions break out on its tail
and paws. It becomes irritable. Its body temperature drops even as it attempts
to make itself warmer than usual. It eats twice as much food as normal but loses
10 to 15 percent of its body weight. After about 17 days of sleeplessness, the
rat dies.
What kills it "We don’t know," says
Rechtschaffen.
Thus it goes in the science of sleep. Rats can
last
A. (A) have experimental research for the science of sleep
B. (B) check up rats’s duration of life after they are hurt
C. (C) have experimental research for rats’s insomnia
D. (D) observe the procedure of rats’s dying
[简答题]Over the past 50 years, technology has changed the fishing industry dramatically. Today, the romantic, rugged individual fisherman is as threatened a species as the cod and tuna that once swarmed into his nets. This is the cumulative result of more sophisticated fishing gear, more powerful boat engines and a lack of regard for local fishing environments by the multinational enterprises that have come to dominate this business.
There are about 30 million professional fishermen worldwide, but 50 percent of the fish caught at sea are captured by only 1 percent of the boats, notes Xavier Pastor, European vice-president for Oceans, a non-profit international advocacy group for the world’s oceans. "Industrialized fishing is leading to the disappearance of the small fisherman," he observes, with concomitant damage to both fish stock and to local economies and social structures.
"Some fleets are just too big," Pastor says. "They are very efficient at taking the last fish in an area, th
[单项选择]
Over the past 600 years, English has grown from a language of few speakers to become the dominant language of international communication. English as we know it today emerged around 1350, after having incorporated many elements of French that were introduced following the Norman invasion of 1066. Until the 1600s, English was, for the most part, spoken only in England and had not extended even as far as Wales, Scotland, or Ireland. However, during the course of the next two centuries, English began to spread around the globe as a result of exploration, trade (including slave trade), colonization and missionary work. Thus, small enclaves (聚居地) of English speakers became established and grew in various parts of the world. As these communities proliferated, English gradually became the primary language of international business, banking, and diplomacy.
Then came the 20th century and its burst of technology. Suddenly people were talking across oceans, flying across continents,
A. The expansion of English as an international language.
B. The number of non-native users of English.
C. The French influence on the English language.
D. The use of English for science and technology.
[填空题]Over recent years, Canada has faced several ______ by countries such as the United States, Mexico, South Korea, and Japan.
[单项选择]She has been in Tianjin for ten years. Tianjin has become her second ______.
A. house
B. family
C. hometown
[单项选择]Over the last 40 years there has been a great increase not only in the number of agricultural pesticides in use but also in the care and sophistication with which they are used by farmers. Nevertheless, the proportion of agricultural crops lost to certain pests worldwide has increased over the same period, even when the pests concerned have not developed resistance to existing pesticides.
Which of the following, if true, best explains how improvements in pesticide use have been accompanied by greater losses to certain pests
A. Some dangerous but relatively ineffective pesticides common 40 years ago are no longer in widespread use.
B. As pesticides have become increasingly pest-specific, controlling certain pests with pesticides has turned out to cost more in many cases than the value of crop losses caused by those pests.
C. Because today’s pesticides typically have more specific application conditions than did pesticides in use 40 years ago, today’s farmers observe their fields more closely than did farmers 40 years ago.
D. Certain pest-control methods that some farmers use today do not involve the use of chemical pesticides but are just as effective in eliminating insect pests as those that do.
E. (E) Forty years ago, much less was known about the effects of pesticides on humans and other mammalian species than is now known.
[单项选择] Over the last 25 years, British society has changed a great deal — or at least many parts of it have. In some ways, however, very little has changed, particularly where attitudes are concerned. Ideas about social class — whether a person is "working-class "or "middle-class"— are one area in which changes have been extremely slow.
In the past, the working-class tended to be paid less than middle-class people, such as teachers and doctors. As a result of this and also of the fact that workers’’ jobs were generally much less secure, distinct differences in life-styles and attitudes came into existence. The typical working man would collect his wages on Friday evening and then, it was widely believed, having given his wife her "housekeeping" ,would go out and squander the rest on beer and betting.
The stereotype of what a middle-class man did with his money was perhaps nearer the truth. He was — and still is — inclined to take a longer-term view. Not only did he regard buying
A. Desiring for security.
B. Making long-term plans.
C. Having priorities in life.
D. Saving money.
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