如图所示,我国自行设计、制造的第一颗人造地球卫星“东方红一号”运行轨道为椭圆轨道

题型:选择题

问题:

如图所示,我国自行设计、制造的第一颗人造地球卫星“东方红一号”运行轨道为椭圆轨道,其近地点M和远地点N的高度分别为439km和2384km,“东方红一号”卫星(  )

A.在M点的速度小于在N点的速度

B.在M点的加速度小于在N点的加速度

C.在M点受到的地球引力小于在N点受到的地球引力

D.从M点运动到N点的过程中动能逐渐减小

考点:人造地球卫星万有引力定律的其他应用
题型:选择题

阅读理解

                                                                            Too Pleased with Oneself

     In the Spring and Autumn period, there was a major minister, Yan Ying. He was very wise and always treated people

with the best manners. So he was very highly respected.

     Yan Ying had a wonderful horse and carriage(马车).When his driver sat on the carriage, driving for such a great man,

he felt quite proud about it. One day, as he was driving the carriage past his home, his wife saw him sitting at the front

of the carriage so proud that she found it uncomfortable, and was quite ashamed of(以…为耻辱) him.

     That evening, when her husband came home, she told him that she felt sick when she saw how proud he was when

he drove the carriage for Yan Ying.  She said,''Yan Ying is a major minister, and highly respected. But he sat in the

carriage without any pride. You are only a driver, but you looked as if you were an even greater man than Yan Ying. I

don't want share the same room with such a person!" He thought about it, and realized that he was wrong. He promised

her never to behave that way again.

     From then on, the driver tried to learn from Yan Ying. Yan Ying noticed this, and asked his driver what had caused

him to change. The driver told him what happened. Yan Ying was impressed by what the driver said. Later, he offered

him an official post.

     From the driver's previous(先前的) behavior comes this useful phrase"yang yang de yi". We use it to describe big

heads, people who are far too pleased with themselves.

阅读上面短文,回答下列问题.

1. Why was Yan Ying respected?

    ___________________________________________________.

2. Why was his wife quite ashamed of him?

    ___________________________________________________.

3. What did the man do after that?

    ___________________________________________________.

4. What did Yan Ying do after he heard what his driver said?

    ___________________________________________________.

5. Which kind of people do we often use "yang yang de yi" to describe?

    ___________________________________________________.

题型:选择题

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A.热带

B.南温带

C.北温带

D.北寒带

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题型:选择题

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A、把所有的时间都安排上,越细越好,然后按计划执行

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