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【单选题】

近地小行星多达()多颗,有的科学家戏称,地球就象生活在一个小行星的马蜂窝里。

A.
500
B.
1000
C.
2000
D.
10000
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参考答案:
参考解析:
.
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【单选题】Unless we spend money to spot and prevent asteroids (小行星) now, one might crash into Earth and destroy life as we know it, say some scientists. Asteroids are bigger versions of the meteoroids (流星) that...

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.