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  3. The Case of the Disappearing Fingerprints One useful anti-cancer drug can effectively erase the whorls and other characteris

The Case of the Disappearing Fingerprints One useful anti-cancer drug can effectively erase the whorls and other characteris

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问题                 The Case of the Disappearing Fingerprints
    One useful anti-cancer drug can effectively erase the whorls and other characteristic marks that give people their distinctive fingerprints. Losing【C1】______could become troublesome. A case released online in a letter by Annals of Oncology indicates how big a【C2】______of losing fingerprints is.
    Eng-Huat Tan, a Singapore-based medical doctor describes a 62-year old man who has used capecitabine to 【C3】______his nasopharyngeal cancer. After three years on the【C4】______, the patient decided to visit U. S. relatives last December. But he was stopped by U. S. customs officials【C5】______4 hours after entering the country when those officials couldn’t get fingerprints from the man. There were no distinctive swirly【C6】______appearing from his index finger.
    U. S. customs has been fingerprinting incoming foreign visitors for years, Tan says. Their index fingers are【C7】______and screened against digital files of the fingerprints of bad guys—terrorists and potential criminals that our federal guardians have been tasked with keeping out of the country. Unfortunately, for the Singaporean travelers, one potential【C8】______effect of his drug treatment is a smoothing of the tissue on the finger pads. 【C9】______, no fingerprints. " It is uncertain when fingerprint loss will【C10】______to take place in patients who are taking capecitabine," Tan points out. So he cautions any physicians who【C11】______the drug to provide their patients with a doctor’s note pointing out that their medicine may cause fingerprints to disappear.
    Eventually, the Singapore traveler made it into the United States. I guess the name on his passport didn’t raise any red flags. But he’s also now got the explanatory doctor’s note—and won’t leave home【C12】______it.
    By the way, maybe the Food and Drug Administration,【C13】______approved use of the drug 11 years ago, should consider【C14】______its list of side effects associated with this medicine. The current list does note that patients may experience vomiting, stomach pain and some other side effects. But no where【C15】______it mention the potential for loss of fingerprints.
【C13】
选项 A、who
B、where
C、when
D、which
答案D
解析 哪一个政府机构许可(approved)使用该类抗癌药?就是本段第一句提到的theFood and Drug Administration。四个选项中，只有关系代词which能指代the Food andDrug Administration，它是approved动作的发出者。
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