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  3. The Caffeine Habit There are more than 170 million drug addicts in the U. S. , and the strange thing is that you can be coun

The Caffeine Habit There are more than 170 million drug addicts in the U. S. , and the strange thing is that you can be coun

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问题                         The Caffeine Habit
    There are more than 170 million drug addicts in the U. S. , and the strange thing is that you can be counted as one of them. You consume your drug of choice every day;you’ d feel ill if you couldn’ t have it; you’ d have a hard time quitting it.
    【B1】______And if you think you get it only in coffee, tea, coca cola, or in smaller bite of chocolate, you haven’t been paying attention. Food manufacturers recognize a hot market when they see it, and with anywhere from 55% to 90% of the U. S. population consuming caffeine every day.【B2】______The popular Red Bull energy drink is one of them, and others like caffeine-infused gum, mints, beer, candy, even soap—which is supposed to provide its caffeine boost through the skin.
    Regular amount of caffeine has been the subject of endless medical studies. We know caffeine could work effectively by controlling neurotransmitters that would normally make you sleepy, improving cognitive function and even athletic performance. 【B3】______"Exactly what level of caffeine is harmful is not clearly established, but generally more than five cups of coffee is too much, " said physiologist Harris Lieber-man from U. S. Army Research Institute of Environmental Medicine, who has been studying the effects of caffeine for more than 20 years. "It’ s typically possible to die from a caffeine overuse, but, " says Dr. Eric Lavonas, a North Carolina emergency-room doctor, "you have to really work at it. "【B4】______Bill Bradley, in 2000 presidential candidate, attributed his irregular heartbeat to caffeine overuse.
    In a country of caffeine addicts, it’ s unlikely that you ’ 11 never develop a serious problem, and there aren’ t any repair centers for coffee dependence.【B5】______The highest caffeine boost can be felt one hour following input, but significant effects can last for eight hours. If you’ re at risk for heart disease or digestive disorders, talk to your doctor about how much caffeine you should be drinking. Like any pleasurable substance, caffeine can be abused. So enjoy—but with care.
A. Depending on the study, the stuff now is turning up everywhere.
B. The chemical that has you addicted, of course, is caffeine.
C. But how much is too much?
D. Far more common are people who simply fall ill from eating or drinking too much of that stuff.
E. Here are seven tips to loosen the death grip of caffeine addiction.
F. So the best advice is to know your limits.
【B3】
选项
答案C
解析 根据空格前“We know caffeine could work effectively by controlling neurotransmitters thatwould normally make you sleepy，improving cognitive function and even athletic performanee．(我们知道咖啡因会有效控制通常会使你昏昏欲睡的神经递质，改善认知功能甚至运动性能)”，以及空格后“Exactly what level of caffeine is harmful is not clearly established，but generally more thanfive cups of coffee is too much(究竟什么水平的咖啡因是有害的，没有明确规定，但一般超过5杯咖啡就实在是太多了)”。两者相联系，可知选项C最符合逻辑。
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