The Earth’s daily clock, measured in a single revolution

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　　1、The Earth’s daily clock, measured in a single revolution, is twenty-four hours. The human clock, 1, is actually about twenty-five hours. That’s 2 scientists who study sleep have determined from human subjects who live for several weeks in observation chambers with no 3 of day or night. Sleep researchers have 4 other surprising discoveries as well.We spend about one-third of our lives asleep, a fact that suggests sleeping. 5 eating and breathing, is fundamental life process. Yet some people almost never sleep, getting by on as 6 as fifteen minutes a day. And more than seventy years of 7 into sleep deprivation, in which people have been kept 8 for three to ten days, has yielded only one certain findings: Sleep loss makes a person sleepy and that’s about all; it causes no lasting ill 9. Too much sleep, however, may be 10 for you.These findings 11 some long-held views of sleep, and they raise questions about its fundamental purpose in our lives. In 12, scientists don’t know just why sleep is necessary.“We get sleepy, and when we sleep, that sleepiness is reversed,” Dr. Howard Roffwarg of the University of Texas in Dallas explains. “We know sleep has a function, 13 we feel it has a function. We can’t put our finger on it, but it must, 14 in some way, direct or indirect, have to do with rest and restitution.”Other scientists think sleep is more the result of evolutionary habit than 15 actual need. Animals sleep for some parts of the day perhaps because it is the 16 thing for them to do: it keeps them 17 and hidden from predators; it’s a survival tactic. Before the advent of electricity, humans had to spend at least some of each day in 18 and had little reason to question the reason or need for 19 But the development of the electroencephalograph and the resulting discovery in 1937 of dramatic 20 in brain activity between sleep and wakefulness opened the way for scientific inquiry in the subject.

　　问题1

　　A、however

　　B、furthermore

　　C、likewise

　　D、therefore

　　问题2

　　A、the

　　B、what

　　C、because

　　D、many

　　问题3

　　A、idea

　　B、feeling

　　C、sense

　　D、judgment

　　问题4

　　A、come up against

　　B、come down to

　　C、come up with

　　D、come up to

　　问题5

　　A、with

　　B、like

　　C、unlike

　　D、as

　　问题6

　　A、little

　　B、much

　　C、few

　　D、long

　　问题7

　　A、probe

　　B、investigation

　　C、research

　　D、examination

　　问题8

　　A、asleep

　　B、sleepy

　　C、active

　　D、awake

　　问题9

　　A、effects

　　B、affections

　　C、affects

　　D、impacts

　　问题10

　　A、useful

　　B、good

　　C、bad

　　D、harmful

　　问题11

　　A、challenge

　　B、deny

　　C、doubt

　　D、dispute

　　问题12

　　A、addition

　　B、fact

　　C、line

　　D、short

　　问题13

　　A、if

　　B、because

　　C、like

　　D、provided

　　问题14

　　A、at least

　　B、at most

　　C、at best

　　D、at worst

　　问题15

　　A、from

　　B、an

　　C、the

　　D、of

　　问题16

　　A、worst

　　B、best

　　C、only

　　D、natural

　　问题17

　　A、comfortable

　　B、calm

　　C、quiet

　　D、excited

　　问题18

　　A、coldness

　　B、warmth

　　C、darkness

　　D、shade

　　问题19

　　A、sleep

　　B、work

　　C、food

　　D、clothes

　　问题20

　　A、differences

　　B、similarities

　　C、resemblance

　　D、opposites

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