Caffeine does not alter the need for sleep, but it does offer a temporary solution to fatigue for people who need to stay alert. Research has shown that sleep-deprived individuals who consumed caffeine had improved memory and reasoning abilities, at least in the short term. Studies of runners and cyclists have shown that caffeine can improve their stamina - hence its addition to energy-boosting sports drinks.
People who consume a lot of caffeine regularly may develop temporary withdrawal symptoms, headache being the most common, if they quit or cut back on it abruptly. Fortunately, these symptoms last only a day or two in most cases. Individuals who are more sensitive to the stimulatory side effects of caffeine may want to avoid it, but most doctors agree that the equivalent of three cups of coffee a day does not harm healthy people. There is no medical basis to give up daily caffeine and many reasons to include a moderate amount in ones diet.
36. Drinking coffee or tea may help
A. lower the incidence of being overweight.
B. lower the incidence of non-melanoma skin cancer.
C. increase the incidence of endometrial cancer.
D. increase the incidence of liver cancer.
【答案】:B
37. Caffeine is used to
A. reduce high blood pressure.
B. relieve headaches.
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