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问题 选择题

下面哪种几何体的截面不可能是长方形[ ]

A．长方体

B．正方体

C．圆柱

D．圆锥

答案

答案：D

选择题

如图所示的四种现象中,属于光沿直线传播现象的是：
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填空题
用下列短语的适当形式填空。
In the future      grow up      find out      all over the world       no longer 
be able to     all the time      at a distance of      in order to      be worth it
1. Don't worry. They will               tell you the news soon.
2. Tom studied late at night                pass the exam.
3. I believe people could travel in space               . 
4. Who said we couldn't play with toys when we              ?
5. The math problem is very difficult, so she fails to               the right answer.
6. This planet is               303,297,200 kilometres, and we can't see it with our eyes.
7. Remembering these words is hard, but it              .
8. The carriage (马车) is                used in most cities nowadays.
9. A new film will be on tomorrow morning, and Jack was thinking about it               this afternoon.
10. In 2008, you will see people                gather in Beijing to join the Olympic Games.
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