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问题 单项选择题

关于Lynch综合征，叙述错误的是（）

A.是常染色体显性遗传性疾病

B.分子遗传学基础是DNA错配修复基因突变或功能失活

C.息肉数多少不等，多为绒毛状腺瘤

D.肠癌多位于左半结肠，单发

E.常为黏液腺癌或髓样癌

答案

参考答案：D

单项选择题

灵敏度是指（）

A.试验检出阴性的人数占无病者总数的比例

B.试验检出阳性的人数占有病者总数的比例

C.筛检阴性者中真正成为非病人的可能性

D.筛检方法能将实际有病的人正确地判断为阳性的能力

E.试验检出阳性的人数占无病者总数的比例
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单项选择题

When butterfat was considered nutritious and healthful, a law was enacted requiring that manufacturers use the term "imitation butter" to indicate butter whose butterfat content had been diminished through the addition of water. Today, it is known that the high cholesterol content of butterfat makes it harmful to human health. Since the public should be encouraged to eat foods with lower rather than higher butterfat content and since the term "imitation" with its connotations of falsity deters many people from purchasing products so designated, manufacturers who wish to give reduced-butterfat butter the more appealing name of "lite butter" should be allowed to do so.
Which one of the following, if true, most seriously undermines the argument

A．The manufacturers who prefer to use the word "lite" instead of "imitation" are motivated principally by the financial interest of their stockholders.

B．The manufacturers who wish to call their product "fire butter" plan to change the composition of the product so that it contains more water than it now does.

C．Some individuals who need to reduce their intake of cholesterol are not deterred from using the reduced-butterfat product by the negative connotations of the term "imitation."

D．Cholesterol is only one of many factors that contribute to the types of health problems with which the consumption of excessive amounts of cholesterol is often associated.

E．(E) Most people deterred from eating "imitation butter" because of its name choose alternatives with a lower butterfat content than this product has.
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