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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?

admin2009-06-15  10
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 参见第五段中“Experts think…Sounds pretty…”译为：专家认为，一颗能摧毁许多生命的小行星可能每50万年撞击一次地球，虽说是相当罕见，但如果小行星陨落，整个世界将会毁灭，A选项符合题意，故选A。
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