答案：their

　　D

　　(2015·南宁适应性测试)What should you do if you are not able to sleep？The best thing is to try to avoid bad habits.1.____________ you always go to bed and get up at about the same time，this sets a 2.____________ (health) rhythm in your life.Don’t drink caffeine drinks in the evening.Smoking and alcohol can also keep you awake.You may have trouble 3.____________ (sleep) if you have a heavy meal just before you go to bed.

　　You may also find it difficult 4.____________ (get) to sleep if you have a problem or something else on your mind.This is 5.____________ you need to relax.As you lie in bed，tense the muscles in your feet and then relax 6.____________ .Continue up the body，tensing and relaxing the muscles until you reach the head.Start with the feet again if you are still tense.If you 7.____________ (think) about a problem or about something exciting that is going to happen the next day，get up and write about it.That will help to take it off your mind.You can also get up and read，but be sure to choose 8.____________ book that is not too interesting.9.____________，you may get so interested that you won’t want to go to sleep even when you feel sleepy.

　　Sleep well！Sweet 10.____________ (dream)!

　　【解题导语】　本文是一篇说明文。失眠会对人体健康造成极大危害。本文介绍了应对失眠的几个方法。

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