To determine the consequences of sleep deficit,researchers have put subjects through a set of psychological and performancetests requiring them, for instance, to add columns of numbers or recall apassage read to them only minutes earlier. Weve found that if youre insleep deficit, performance suffers, says Dr. David. Short-term memory isweakened, as are abilities to make decisions and to concentrate.
1. People in the 18th and 19th centuries used to sleep about 9.5 hoursa night because they
had _______ .
A) no drive and ambition B) noelectric lighting
C) the best sleep habits D)nothing to do in the evening
2. According to Dr. David, Americans _______ .
A) areideally vigorous even under the pressure of life
B) ofienneglect the consequences of sleep deficit
C) do notknow how to relax themselves properly
D) can getby on 6.5 hours of sleep
3. Many Americans believe that _______ .
A) sleep isthe first thing that can be sacrificed when one is busy
B) they needmore sleep to cope with the complexities of everyday life
C) to sleepis something one can do at any time of the day
D) enoughsleep promotes peoples drive and ambition
4. The word subjects refers to______ .
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