题目内容

中国人民银行进行公开市场操作的工具是（）

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Policeman: OK, buddy, your driving license. How fast were you going？
William: Well, it was about 50 mph or less. I was driving very slowly.
Policeman: 50 mph？ __________ All right. That'll be one hundred dollars.

左边给定的是纸盒的外表面，下面哪一项能由官折香而成？

下列选项中的内容，文中没有提及的一项是（）。

阅读短文，回答 21～25 题：
第 21 题 What does the passage say about asteroids and meteoroids？