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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