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【单选题】

If you are worried about things and are under a lot of stress at work or school, then you are probably not sleeping well. Worry can keep you awake, tossing and (26) in bed until the early hours of the morning when you ually (27) asleep. When you wake up, you don’t feel (28) , but tired and worn out and (29) to face a new day.
Dr. Henry Winkle, in a recent newspaper article (30) Stress and Sleep, (31) that stress and lack of sleep are directly (32) Dr. Winkle says, "the more we worry, the (33) we sleep, the more we are unable to deal with (34) " "If we can find a way to get a good night’ s sleep," he (35) ," we can often find the (36) to deal with what’ s worrying us. "
So, what is a good night’ s sleep Research shows that the amount of sleep which people need in order to keep healthy (37) a lot. Seven hours is about the average amount, (38) strangely enough, sleeping longer often gives you a headache (39) of you feel more refreshed.
Dr. Winkle believes that preparing for sleeping is important. People who work late should try to give themselves a short (40) and do something restful before going to bed. This could be watching TV or listening to music. Doing some exercise (41) in the day should help you to feel physically as well as (42) tired. A bedtime drink can also help, but coffee or tea should be avoided as they contain caffeine (咖啡因) and will keep you (43) ." When you put the light (44) ," Dr. Winkle says, "concentrate on relaxing your muscles. Working slowly up from your feet, and you’ll be asleep (45) you know it. \

A.
varies
B.
differs
C.
alters
D.
contrasts
题目标签:咖啡因
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参考解析:
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【单选题】咖啡因过量引起的不良反应不包括()

A.
躁动不安
B.
呼吸抑制
C.
失眠
D.
呼吸加快,心动过速
E.
肌肉抽搐

【单选题】对咖啡因的叙述不正确的是

A.
作用部位在大脑皮层
B.
较大剂量可直接兴奋延脑呼吸中枢
C.
中毒剂量时可兴奋脊髓
D.
收缩支气管平滑肌
E.
直接兴奋心脏,扩张血管

【单选题】咖啡因的反应()

A.
与吡啶硫酸铜溶液作用生成紫堇色
B.
与盐酸、氯酸钾在水浴上加热蒸干,再遇氨生成紫色,加氢氧化钠数滴,紫色消失
C.
加氢氧化钾醇溶液和一粒固体请氧化钾,初显深紫堇色,继变暗红色,最后颜色消失
D.
加三氯化铁试剂呈蓝色
E.
在碱性溶液中水解有甲醛生成

【单选题】咖啡因过量引起的不良反应不包括()

A.
躁动不安
B.
呼吸抑制
C.
失眠
D.
呼吸加快,心动过速
E.
肌肉抽搐