2. 外语
  3. Opinion polls repeatedly tell us that the only thing Americans worry about more than the environment is their health. This is【C1

Opinion polls repeatedly tell us that the only thing Americans worry about more than the environment is their health. This is【C1

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问题     Opinion polls repeatedly tell us that the only thing Americans worry about more than the environment is their health. This is【C1】______understandable, for health is obviously【C2】______to illness. What makes today’s concern【C3】______health slightly surprising is that Americans are【C4】______healthier now than they have ever been. Many diseases that once【C5】______terror into hearts have either been completely【C6】______or brought under control. Although AIDS is a notable【C7】______， few new mass killers have come out to【C8】______the ones that have been eliminated.【C9】______. health — and the various threats to it — remains everyone’s【C10】______concern. After all, more than half of us (57 percent) will die from either heart disease or cancer, if current【C11】______continues.
    One major problem with any【C12】______of health risks — especially life-threatening ones — is that they【C13】______enormously in their immediacy. For instance, AIDS — if you get it — will probably be【C14】______after a number of years. Cancer induced by smoking or【C15】______to radiation, on the other hand, may take 20 to 30 years【C16】______its fatal effects show【C17】______. In making choices about health risks,【C18】______. it is important to bear in 【C19】______the likely time lag between taking a risk and【C20】______its consequences.
【C16】
选项 A、after
B、when
C、before
D、until
答案C
解析 结构衔接题。这里指在癌症病发前可能会有二十或三十年的时间，[C]before符合题意。
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大学英语四级

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