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问题 单项选择题

水果店有甲、乙、丙三种水果，老李所带的钱如果买甲种水果刚好可买4千克；如果买乙种水果刚好可买6千克；如果买丙种水果刚好可买12千克。老李决定三种水果买一样多，那么他带的钱能买三种水果各( )千克。

A．5
B．4
C．3
D．2

答案

参考答案：D

解析： 设老李带的钱为“1”，则三种水果的单价分别是1/4，1/6，1/12。1/4+1/6+1/12=1/2，1÷1/2=2(千克)。

完形填空

三. 句型转换 ( 10分)

1. There are different ways of doing this.

There are ________________ ways of doing this.

2. He is more than my teacher; he is my friend.

He is ____________ _____________ my teacher; he is my friend.

3.They named their baby Tom, which is also the name of the baby’s grandfather.

The baby was _____________ ___________ his grandfather.

4. A large park has been built in our city; we are able to amuse ourselves after work.

The large park built in our city ____________ us __________ a place to enjoy ourselves.

5. I’ll do all I can to finish the work on time.

I’ll do ___________ __________ ____________ to finish the work on time.
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单项选择题

两个质量相同、半径不同的均质圆盘，初始静止于光滑水平面上，若在此两圆盘上同时作用有相同的常力偶，在下述情况下比较两圆盘的动量、动量矩、动能的大小（）。

（1）经过同样的时间间隔。

（2）转过同样的角度。

A．情况(1)时，动量相同，动量矩相同，动能不同

B．情况(1)时，动量相同，动量矩不同，动能不同

C．情况(2)时，动量不同，动量矩不同，动能不同

D．情况(2)时，动量相同，动量矩相同，动能不同
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