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问题 选择题

铁最容易生锈的情况是（　　）

A．在干燥的空气中

B．在潮湿的空气中

C．浸没在纯净的水中

D．浸没在机油中

答案

A、在干燥的空气中铁不与水接触，不易生锈，故A错误；

B、在潮湿的空气中，铁与水和氧气同时接触，易生锈，故B正确；

C、浸没在纯净的水中，铁不与氧气接触，不易生锈，故C错误；

D、浸没在机油中，铁不与水和氧气接触，不易生锈，故D错误；

故选B．

情景交际

根据对话情景和内容，从对话后所给的选项中选出能填入每一空白处的最佳选项。选项中有两个为

多余选项。

Jerry: Hi, Mike. Look like you've got some sun.

Mike: I guess so. I spent the weekend on the beach.

Jerry: Really? That sounds exciting. 1_____ 

Mike: At my friend's house.He invited me to stay there for as long as I wanted.

Jerry: 2_____

Mike: Oh, I have a paper to work on.

Jerry: 3_____ I mean besides lying out in the sun.

Mike: I play some volleyball. I never realized how hard it is to run on sand.

Jerry: 4_____ Did you go swimming?

Mike: I intended to. 5_____ So I just went fishing. 

Jerry: All sounds so relaxing.

A. What a pity!

B. It must be cool.

C. Where did you stay?

D. But how did you get there?

E. So what else did you do out there?

F. But the water wasn't warm enough.

G. Then why not stay there for a longer time?

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多项选择题

高血压的治疗措施应该是综合性的，以下各项中属于高血压的非药物治疗的是（）

A.补钙

B.科学饮食

C.气功

D.运动

E.减肥
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