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Who can think of a situation __________ this idiom can be used?
A. which B. that C. where D. in that
Can you think of a situation __ the idiom is used properly?
A. where B. that C. for which D. which
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完形填空
Scientists are learning more about our need for sleep. Most people sleep 1 eight hours each night. Some people sleep more than 2 and others sleep as few as two or three hours each night. Scientists do not know exactly 3 some people sleep more than others. Dr. Ernest Hartman has a(n) 4 about this. He believes the 5 of sleep depends on how a person attacks problems. He said people who need only a few 6 sleep usually are people who have much energy and make good 7 of time to get their work 8 quickly. But he said many people who sleep 9 than normal do creative work and seem to need 10 dreaming time to find 11 to emotional problems. Some scientists agree with this idea and others argue.
To determine the results of the 12 of sleep, scientists have put subjects 13 a set of mental and performance tests 14 them, for instance, 15 columns of numbers or recall a passage 16 to them only minutes earlier, “We've found 17 you're in sleep deficit(缺乏), performance 18 ,” says Dr. David. Short-term memory is 19 , as are abilities to 20 decisions and to concentrate.
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