2. 外语
  3. Caffeine is a drug that is naturally produced in the leaves and seeds of many plants. It’s also produced 【S1】______and added to

Caffeine is a drug that is naturally produced in the leaves and seeds of many plants. It’s also produced 【S1】______and added to

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问题     Caffeine is a drug that is naturally produced in the leaves and seeds of many plants. It’s also produced  【S1】______and added to certain foods. Caffeine is defined as a drug because it stimulates the central nervous  system, causing increased heart rate and【S2】______. Most people who axe sensitive to caffeine experience a【S3】______ increase in energy and elevation in mood.
    Caffeine is in tea leaves, coffee beans, chocolate, many soft drinks, pain relievers, and other over-the-counter  pills. In its natural form, caffeine tastes very bitter. But most caffeinated drinks have gone through enough processing to camouflage(/伪装，隐藏) the【S4】______taste.
    If you’re taking in too much caffeine, you may want to cut back. Kicking the caffeine habit is【S5】______easy, and the best way is to cut back slowly.【S6】______you could get headaches and feel achy, depressed, or lousy.
    Try cutting your intake by substituting non-caffeinated drinks for caffeinated sodas and coffee. Examples  include water, caffeine-free sodas, and caffeine-free teas. Keep track of how many caffeinated drinks you have each day, and【S7】______one drink per week with a caffeine-free【S8】______until you’ve gotten below the 100-milligram mark.
    As you cut back on the【S9】______of caffeine you consume, you may find yourself feeling tired. Your best bet is to hit the sack, not the sodas: it’s just your body’s way of telling you it needs more rest. Your energy levels will return to【S10】______in a few days.

A) never             B) particular      C) bitter            D) artificially
E) mechanically      F) otherwise       G) substitute        H) normal
I) effect            J) amount          K) simultaneous      L) alertness
M) temporary         N) optional        O) alternative
【S2】
选项
答案L
解析 本句在解释：咖啡因刺激神经系统，导致心跳加快和______。在备选答案中选择 alertness符合句意。alertness意为“机敏、敏锐、活跃”。
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大学英语四级

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