下列说法正确的是( )。A．资产负债表资产方反映了企业所拥有或控制的经济资源比例

阅读理解。

     Do you know why you sleep? You may think it's because you're tired. Or perhaps you've been told sleep

is good for you. Yet no one knows exactly why or how people sleep.

      Until the early 1950s, most scientists thought the body and brain rested during sleep. Then a scientist

watched people sleep. He noticed that during periods of between 5 and 30 minutes, sleepers' eyes made

rapid movements, as if they were watching something. He called these periods REM (Rapid Eye Movement)

sleep. He called periods when sleeper's eyes did not move non -REM sleep.

     Whenever the scientist woke people during REM sleep, they were having vivid dreams. Measurements

showed that sleepers' pulses (脉搏) went up quickly during REM sleep. Their breathing, heartbeat, and the

blood going to the brain also increased. Far from being a time of rest, sleep is a time when the body is hard

at work. Scientists still don't know the reason for this. Some believe REM sleep makes learning easier.

Babies spend a lot of time on REM sleep. Because of this, some scientists believe that REM sleep helps

the brain grow. Others think REM sleep is a time for the brain to empty the day's garbage.

      One thing all the scientists agree on is that sleep is necessary. Without enough sleep, people make

mistakes. Most car accidents happen during the early morning hours, when people are sleepiest.

1. You may read the passage in _____. [ ]

A. an advertisement

B. a history book

C. a science book

D. a telephone book

2. During REM sleep, a person's breathing and heartbeat _____.　 [ ]

A. stop

B. increase

C. sleep

D. stay the same.

3. The underlined word "vivid" in the passage means _____. [ ]

A. 简单的

B. 空洞的

C. 生动的

D. 鲜艳的

4. What is the main idea of the article? [ ]

A. REM sleep has been observed by all scientists.

B. REM sleep helps the brain grow.

C. REM sleep is a time to empty the day's garbage.

D. REM sleep is an active time when the body is hard at work. 

5. We can know from the article that REM sleep ._____ [ ]

A. has an effect on people.

B. can be stopped with lots of sleep.

C. is something that all people experience.

D. is something that all scientists agree on.

对于糖尿病患者的运动以下哪些不正确（）

A.运动总是使糖尿病患者的血糖降低

B.糖尿病患者应进行有一定耐力的持续缓慢消耗的运动

C.1型糖尿病患者的运动宜在餐后进行

D.有大血管和微血管并发症者应在医生指导下运动

E.发生急性感染（如肾盂肾炎、化脓性皮肤感染等），机体发热时，应停止运动。

房地产市场竞争中，既有垄断又有竞争、以竞争为主的市场是( )。

A．垄断竞争市场

B．竞争市场

C．寡头垄断市场

D．完全垄断市场

钢筋闪光对焊接头处的钢筋折弯，不得大于( )，否则切除重焊。

A．5°

B．4°

C．3°

D．2°

中程跟单是指“跟”到指定出口仓库为止。( )