Our sleep influences our mood. Our mood ________, affects our performance.A: by turn

A、in return

B、in vain

C、in short

D、in turn

A.for

B.to

C.toward

D.with

A、sense

B、perceive

C、behave

D、speak

The traditional view is ______ we sleep because our brain is“programmed”to make us do so．

A．when B．why C．whether D．that

A.what

B.that

C.it

D.which

By referring to the limbic system, the author intends to show ______.

A．its function in our dreams

B．the mechanism of REM sleep

C．the relation of dreams to emotions

D．its difference from the prefrontal cortex

（英语类学生必做）

Sleep is important to us because it helps restore organs and tissues in our body. But how much sleep do we actually need？

For most of us, eight hours seems to be about the right amount. Yet we know that there are many people who get 【61】 perfectly with less sleep, and some who may need 【62】 A great deal depends on the 【63】 we live. But a good general rule 【64】 is to sleep as long as we have to in order to feel happy and be able to work 【65】 our best when we awaken.

There are actually different 【66】 of sleep. There is a deep sleep and a shallow sleep. In a shallow sleep our body does not get the same kind of rest it gets in a 【67】 sleep, 【68】 after eight hours of a shallow sleep we may still feel tired. But a short, deep sleep can be very 【69】 Alexander—the Great Emperor was able to get a deep sleep 【70】 he needed it. Once, during the night before an important battle, he remained 【71】 longer than anyone else. 【72】 he wrapped himself in a cloak and 【73】 down on the earth. He slept so 【74】 that his generals had to wake him three times for him to give the 【75】 to attack!

Normally when we go to sleep, our " sleep center" blocks off nerves so that 【76】 our brain and body go to sleep. 【77】 prevents us from wanting to do anything, and the other 【78】 our internal organs and limbs go to sleep. 【79】 sometimes only one goes to sleep and the other does not. A very tired soldier can sometimes 【80】 asleep (brain sleep) and keep on marching, because his body is not asleep.

(86)

A．across

B．away

C．along

D．over

"It's 53.____a myth that older people need less sleep. The more healthy an older adult is, the more they sleep like they did when they were 54.____. Our data suggests that older adults would benefit from 55 to get as much sleep as they did in their 30s. That's 56.____from person to person, but the amount of sleep we had at 35 is probably the same amount we need at 75."

By referring to the limbic system, the author intends to show ________.

[A] its function in our dreams

[B] the mechanism of REM sleep

[C] the relation of dreams to emotions

[D] its difference from the prefrontal cortex