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  3. What does the passage say about asteroids and meteoroids? What do scientists say about the collision of an asteroid with Earth?

What does the passage say about asteroids and meteoroids? What do scientists say about the collision of an asteroid with Earth?

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问题 What does the passage say about asteroids and meteoroids?
What do scientists say about the collision of an asteroid with Earth?
选项 A、It is very unlikely but the danger exists.
B、Such a collision might occur once every 25 years.
C、Collisions of smaller asteroids with Earth occur more often than expected.
D、It’s still too early to say whether such a collision might occur.
答案A
解析 依据文章第五段第三行始可以断定小行星与地球的碰撞概率极小，但可能性确实存在，这正是A项的内容。
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