题目内容：

阅读理解 阅读下面的短文，然后根据短文内容，在每小题所给的四个选项中选出最佳选项。

Medical experts (专家)say most Americans do not get enough sleep. They say more Americans need to take a nap—that is to rest for a short time in the middle of the day. They give people advice to sleep lightly before continuing with other activities.The experts say naps might improve health by reducing pressure(压力).

Some western companies have supported the idea of napping for many years. They ask people to leave work, go home and have a nap before returning. In the United States, some companies let workers rest simply in their offices. They believe this can help workers make fewer mistakes and also increase (提高) the amount of work that a person can do.

Sleep experts say it is likely that people make more mistakes at work than at other times. They say people should not carry out important tasks when they feel sleepy. And they say the best thing to do is to take a nap. About twenty minutes of rest is all you need. Experts say this provides extra energy and can increase your effects until the end of the day. But experts said that a nap should last  (持续) no more than twenty to thirty minutes. A longer nap will put the body into deep sleep and waking up will be difficult.

1.This passage is probably taken from ________.

A. a story book             B. a poster

C. a film review           D. a medical magazine

2. What’s the best way to increase workers’effects?

A. Talking with friends.

B. Doing relaxing exercises.

C. Laughing, smiling and crying.

D. Having a rest for twenty or thirty minutes.

3. The best title of the passage is ________.

A. taking a nap during the day

B. the advantages of deep sleep

C. the disadvantages of taking a nap

D. Americans who don’t have a nap