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问题 单项选择题

从房室瓣关闭到动脉瓣开放的间隔期相当于（）

A.房缩期

B.等容收缩期

C.射血期

D.室缩期

E.等容舒张期

答案

参考答案：B

单项选择题

输油站每天定时向中心调度室汇报（）消耗量。

A.气和油

B.油和电

C.电和水

D.水和气
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问答题

Directions:

You are a teacher of English. The editor of Campus News asked you to recommend two English books for students to read during the summer. Your article should include:

1) brief introductions to the books; and

2) reasons for your recommendation.
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