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问题 单项选择题

单纯马尾神经受压不会出现以下哪个表现

A．腰骶部疼痛

B．双下肢疼痛

C．会阴部麻木

D．二便控制困难

E．股四头肌肌力减退

答案

参考答案：E

解析：股四头肌肌力减退是股神经受压的表现，与马尾神经无关。

解答题

春季植树时，移栽的树苗常被剪去大量的枝叶，这是为了降低树苗的呼吸作用．______．
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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.

（67）是（）

A.relevant

B.irrelevant

C.complicated

D.complex
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