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  3. Many Americans have been feeding a baby aspirin once a day, believing it would protect them from a heart attack, a stroke, and e

Many Americans have been feeding a baby aspirin once a day, believing it would protect them from a heart attack, a stroke, and e

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问题     Many Americans have been feeding a baby aspirin once a day, believing it would protect them from a heart attack, a stroke, and even cancer. But several recent studies have 【C1】________this into question.
    One large-scale study【C2】________more than 19,000 healthy people ages 65 and older. Participants were【C3】________assigned to take either 100 mg of aspirin (slightly more than the 81 mg dose that【C4】________people take) or a placebo (a harmless substance given to a sick person【C5】________medicine, without telling them it is not real) every day for an average of 4.7 years.【C6】________did people in the aspirin group not【C7】________their risk of heart disease, dementia, or disability, but they were also more【C8】________to suffer from significant bleeding in the digestive tract or brain. And they were more likely to die【C9】________apparently because of an increased risk of【C10】________cancer.
    【C11】________, a trial of more than 12,500 people ages 55 and older【C12】________to have a moderate cardiovascular risk found no benefit to taking aspirin daily. In a study of more than 15,000 people with diabetes, a daily aspirin did【C13】________heart attacks and strokes, but it also【C14】________ major bleeding. And according to an analysis of data from more than 117,000 people,【C15】________ people needed larger doses of aspirin to help【C16】________their risk of heart attack, stroke, and cancer.
    The bottom line: Although there is good【C17】________that aspirin can help people who have already had or are at【C18】________risk for heart attacks or strokes, the drug’s【C19】________is not so clear for people, especially older people, with less risk.【C20】________your doctor before starting—or stopping—aspirin.
【C3】
选项 A、selectively
B、deliberately
C、randomly
D、casually
答案C
解析 本题空格处需要填入一个副词，修饰谓语动词assigned，也需满足句意“受试者被________分配每天服用100毫克阿司匹林……”。根据句意可知，既然是做研究，就需要实现结果的客观性，因而不对受试人群进行刻意区分， “任意或者随机”才能保证最后的结果是严谨的，四个选项中只有C项randomly“随机地”符合句意，故为正确答案。A项selectively意为“选择性地”；B项deliberately意为“故意地”；D项casually意为“偶然地，不经意地”，三个选项代入原文，均不符合句意，故排除。
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