Question

According to a recent survey, over 23 percent of Chinese high school students have trouble.

There are a number of conditions that can make it _______ for teenagers to get the rest they need. During the teenage years, the body's biological clock(生物钟) tells them to fall asleep later at night and wake up later in the morning.

But the body clock isn't the _______ reason teens lose sleep. Lots of people have insomnia(失眠症). All kinds of things can lead to insomnia such as illness, moods and sleeping environment. The most common _______ is stress. “On the notice board the teacher puts everyone's grades up, from first to last,” said Zeng Lei, 16, Hubei. “I'm so worried about my grades that I can't sleep.”

Some teens find they wake up during the night, because they don't have enough iron in their body. Their legs or arms _______ during the sleep making it hard to sleep. Others have nightmares(梦魇) so often they can't get the rest they need.

To enjoy good sleep, doctors say that a teenager needs a healthy lifestyle. That means _______ regular hours and not watching too much TV, using computer too often, or reading too much in bed. They should also try not to drink coffee or tea, eat heavy meals or exercise before bed, _______ these can keep them awake.

It's good idea for a person who keeps having trouble with sleep to see a doctor. “You need to listen to what doctors say,” said Dr Yuan Yonggui of the School of Medicine at Southeast University. He warns against taking medicine if it's not from the doctor.

1.A.unusual B.tiring C.difficult D.impossible

2.A.best B.biggest C.only D.last

3.A.cause B.illness C.situation D.sense

4.A.rest B.grow C.increase D.move

5.A.keeping B.taking C.choosing D.making

6.A.when B.since C.although D.if

Answer 1