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问题 选择题

如图所示，粗糙的足够长的竖直木杆上套有一个带正电的小球，整个装置处在由水平匀强电场和垂直于纸面向外的匀强磁场组成的足够大的复合场中，小球由静止开始下滑，在整个运动过程中小球的v－t图象如图所示，其中正确的是

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A．

B．

C．

D．

答案

答案：C

听力题

用括号内所给单词的适当形式填空。（5分）

Will you help ______ (clean) up the classroom?

2.  It is a ______(please) for me to stay with you.

3.  Eating too much _________(fry) food is not good for our health.

4.  They plan ______(set) up a basketball team in our school.

5.  At last they were in__________. (agree)

6.  Our teacher asks us to read some __________(educate) books in our free time.

7.  China has many fantastic sights, _________(include) the Great Wall.

8.  Yesterday we saw some _________(fisherman) fishing in the river.

9.  Beijing is one of the ___________(lively) cities in China.

10. The article ________(main) talked about teenagers’ problems.
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单项选择题

使用骑乘收益率曲线这类方法的投资者，是以( )为目标，投资于短期固定收入债券。

A．负债总额
B．资产总额
C．资产的流动性
D．资产负债率大小
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