D. signs

　　48. A. solution

　　B. comfort

　　C. study

　　D. adaptation

　　49. A. blame

　　B. accept

　　C. meet

　　D. expect

　　50. A. actually

　　B. otherwise

　　C. beforehand

　　D. after

　　51. A. put

　　B. get

　　C. build

　　D. bring

　　52. A. solved

　　B. focused

　　C. deserted

　　D. reduced

　　53. A. get you away

　　B. find you out

　　C. set you apart

　　D. keep you off

　　54. A. down

　　B. up

　　C. about

　　D. out

　　55. A. effort

　　B. measure

　　C. plan

　　D. action

　　任务型阅读

　　请认真阅读下列短文，并根据所读内容在文章后表格中的空格里填入1个最恰当的单词。

　　注意：每个空格只填1个单词。

　　Naturally regulate your sleep-wake cycle

　　Melatonin(褪黑激素) is a naturally occurring hormone(激素) that helps regulate your sleep-wake cycle. Melatonin production is controlled by light exposure. Your brain should produce more in the evening, when it's dark, to make you sleepy, and less during the day when it's light and you want to stay awake. However, many aspects of modern life can disturb your body's natural production of melatonin and your sleep-wake cycle.

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