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【单选题】

为了纪念这位科学家在科学上的卓越贡献,南京紫金山天文台把该台发现的一颗小行星命名为他的名字,在月球背面也有了以他的名字命名的环形山,他是( )。

A.
祖冲之
B.
郭守敬
C.
郦道元
D.
僧一行
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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.