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问题 选择题

It was not until last week________she found________she thought was quite mistaken. [ ]

A. when; that  

B. that; that

C. when; what  

D. that; what

答案

答案：D

阅读理解

阅读下面短文，掌握其大意，然后根据所给单词的适当形式填空，使短文内容通顺、合理。并将答案完整的填在答题卷上。

In England, people often talk about the weather. Maybe they can experience (经历) four s___1___ in one day. In the morning the weather is warm just like in spring. An hour l___2___ black clouds come and then it rains h___3___. The weather gets a little cold. In the late afternoon the sky will be s___4___, the sun will begin to s___5__, and it will be summer at this time of a day.

In England, people can a__6___ have summer in winter, or have winter in summer. So in winter they can s___7___ in the sea sometimes, and in summer sometimes they should take warm clothes.

When you go to England, you will see that some English people usually take an umbrella or a raincoat w___8_ them in the sunny morning, but you should not l___9___ at them. If you d___10___ take an umbrella or a raincoat, you will regret (后悔) later in the day.
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问答题

一个质量m=10kg的静止物体与水平地面间滑动摩擦系数μ=0.5，受到一个大小为100N与水平方向成θ=37°的斜向上拉力作用而运动，假设拉力作用的时间为t=1s．（g取10m/s2．已知sin53°=0.8，cos53°=0.6）

（1）求1s内拉力做的功；

（2）求1s内摩擦力做的功；

（3）求1s内合外力做的功．
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