2. 外语
  3. The benefits of quitting smoking—reduced risk of cancer and many other health problems—are known. But for millions of smokers, t

The benefits of quitting smoking—reduced risk of cancer and many other health problems—are known. But for millions of smokers, t

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问题     The benefits of quitting smoking—reduced risk of cancer and many other health problems—are known. But for millions of smokers, the【S1】______effect of a cigarette can be reason enough to start up again.
    Studies have found, however, that in reality, lighting up has the【S2】______effect, causing long-term stress levels to rise, not fall. For those dependent on smoking, the only stress it【S3】______is the withdrawal between cigarettes.
    In a recent study【S4】______at the London School of Medicine and Dentistry, researchers looked at 469 people who tried to quit after being【S5】______for heart disease. At the start, the subjects had similar levels of stress and generally believed that smoking helped them to cope. A year later, 41% had managed to stay abstinent(节制的). After controlling for many a【S6】______, the scientists found that the abstainers had "a【S7】______larger decrease in perceived stress," roughly a 20% drop, compared with the continuing smokers, who showed little change.
    The scientists’【S8】______was that the continuing smokers were dealing with uncomfortable cravings(渴望)between cigarettes multiple times a day, while the abstainers, after facing some initial withdrawal, had greater freedom from nicotine cravings and thus had【S9】______a frequent and significant source of stress. Other studies have also found that smokers experience higher levels of stress and【S10】______between cigarettes and lower levels over all when they quit.
A)relieves F)suffered K)conducted
B)summary G)factor L)hypothesis
C)calming H)eliminated M)negative
D)tension I)opposite N)hospitalized
E)significantly J)causes O)dominantly
【S6】
选项
答案G
解析 名词辨析题。根据空格前的many a可知，此处需要填入名词。由常识可知，实验时需要控制一些变量因素以得出结论，故factor“要素，因素”符合句意。
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大学英语四级

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