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【D1】______effect of a cigarette can be reason enough to start up again.
    Studies have found, however, that in reality, lighting up has the【D2】______effect, causing long-term stress levels to rise, not fall. For those dependent on smoking, the only stress it【D3】______is the withdrawal between cigarettes.
    In a recent study【D4】______at the London School of Medicine and Dentistry, researchers looked at 469 people who tried to quit after being【D5】______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【D6】______, the scientists found that the abstainers had "a【D7】______larger decrease in perceived stress," roughly a 20% drop, compared with the continuing smokers, who showed little change.
    The scientists’【D8】______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【D9】______a frequent and significant source of stress. Other studies have also found that smokers experience higher levels of stress and【D10】______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
【D6】
选项
答案G
解析 根据空格前的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“因素”符合句意。
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