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问题 单项选择题

在四环素类药物不良反应中，错误的是（）。

A.长期应用后可发生二重感染

B.会产生光敏反应

C.幼儿乳牙釉质发育不全

D.长期大量静脉给药不引起严重肝脏损害

E.空腹口服易发生胃肠道反应

答案

参考答案：D

解析：大剂量口服或静脉注射四环素类药物可因其沉积于肝细胞线粒体，造成急性肝细胞脂肪性坏死，易发生于孕妇，特别是伴有肾盂肾炎的妊娠妇女，易出现致死性肝中毒。

单项选择题

风险与收益是相互影响、相互作用的，一般遵循( )的基本规律。

A．高风险低收益、低风险高收益
B．高风险高收益、低风险低收益
C．高风险高收益、低风险高收益
D．低风险低收益、高风险低收益
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单项选择题

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.

It is more and more usual that users of Information Retrieval (IR) systems must face up to response of hundreds or thousands of (66) documents. A significant proportion of them are moreover (67) or redundant. This is a straight consequence of two well - known facts: the incessant growing of documental databases and the lack of ability of most users to define (68) information needs. In such a framework, further effective retrieval techniques are only part of the solution. Interfaces with alternative ways for organizing and (69) the results returned by a (70) would be of great utility assisting users to find relevant documents. Document clustering may play a central role as an effective technique for organizing query results.

（69）是（）

A.seeing

B.searching

C.browsing

D.lookingfor
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