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【解析】本题考查万有引力定律的应用。用测力计测得质量为m的仪器重力为P,可以求得火星表面的重力加速度g一，D项正确；由G-mR(>和g一P一C可得火星的半)径和质量，所以可以求出火星的密度，C项正确。

How are you getting along with your senior high school? It may be hard for you as this is the first time that you 1. (leave) your parents. I know that you are now having trouble 2. (communicate) with others, and you may often feel lonely. That’s 3. you are new here and people don’t know about you. But I think you can overcome the difficulty if you can follow the advice below.

First, you should attach great 4. (important) to taking an active part in the discussions and show your own opinions about the matters, and at the same time, learn to listen to other people’s views 5. (careful). Second, you should learn about your classmates’ likes and dislikes, 6. can make you get familiar with them. Only in this way can you get to know more 7. (difference) people and show them that you are just as friendly. Last but not least, I’m always here ready to help. We can take part in some 8. (activity) together and I can introduce you to others.

There’s no need 9. (worry) too much, people will know you more very soon and will like to make friends 10. you if you can do as the above. Just remember, “God helps those who help themselves”.

试题答案

1.have left

2.communicating

3.because

4.importance

5.carefully

6.which

7.different

8. activities

9. to worry

10.with

【解析】

试题分析：考查学生对名词，副词，从句等的掌握情况。

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

考点：考查完成句子。

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