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问题 单项选择题

正常膳食时，钙从尿中排出量约为摄入量的（）。

A.10％

B.20％

C.30％

D.40％

E.50％

答案

参考答案：B

解析：正常膳食时，钙从尿中排出量约为摄入量的20％。

单项选择题

The following questions present a sentence, part of which or all of which is underlined. Beneath the sentence, you will find five ways of phrasing the underlined part. The first of these repeats the original; the other four are different. If you think the original is best, choose the first answer; otherwise choose one of the others.

These questions test correctness and effectiveness of expression. In choosing your answer, follow the requirements of standard written English; that is, pay attention to grammar, choice of words, and sentence construction. Choose the answer that produces the most effective sentence; this answer should be clear and exact, without awkwardness, ambiguity, redundancy, or grammatical error.

Four Dynacorp Optimall Omniprocessors were shipped in the fourth quarter, and it brought to 13 the number of these ultra-high-capacity processors shipped during the year.（）

A. and it brought

B. by bringing

C. and brings

D. having brought

E. bringing
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单项选择题

一批货物要运进仓库，由甲、乙两队合运9小时，可运进全部货物的50%，乙队单独运则要30小时才能运完，又知甲队每小时可运进3吨，则这批货物共有( )．

A．135吨

B．140吨

C．145吨

D．150吨

E．155吨
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