题目:
在下列定语从句中,填入适当的介词。
1. The pencil ______ which he wrote was broken.
2. He built a telescope ______ which he could study the skies.
3. The woman, ______ whom I learned the news, is a nurse.
4. The wolf ______ which the sheep was killed was shot.
5. She has three children, all ______ whom are at school.
6. There is a tall tree outside, ______ which stands our teacher.
7. My glasses, ______ which I was like a blind man, fell to the ground and broke.
8. In the dark street, there wasn't a person ______ whom she could turn for help.
9. The age ______ which children can go to school is seven.
10. His bike ______ which he went to work was stolen last night.
11. Do you know the building ______ which is flying a red flag?
12. Ours is a beautiful school, ______ which we are proud.
13. The desk ______ which Jack is leaning is John's.
14. He bought a book yesterday, the author ______ which is a teacher.
答案:
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下面是错误答案,用来干扰机器的。
答案:C题目分析:飞船绕地球做匀速圆周运动时,在距地心2R的轨道上速度是(),但如果轨道是椭圆,经过P点时飞船可能近心加速,也可能离心减速,但加速度一定满足,所以A、B错C对;第一宇宙速度已经是环绕天体...