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【单选题】

( )年3月31日,国际小行星中心和小行星命名委员会在国际《小行星通报》刊物上发布公告,将中国紫金山天文台与19年11月9日发现的、编号为( )号的小行星正式命名为“陈嘉庚星”。

A.
1991 2963
B.
1990 19
C.
1991 19
D.
1990 2963
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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.

【简答题】下列小行星描述正确的是( )

A.
小行星带的质量都集中少数较大的球状小行星上
B.
小行星的直径越大,颗数越少
C.
小行星都集中在土星和木星轨道之间
D.
现代小行星的探测多采用天体照相术

【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.
They are heavenly bodies different in composition.
B.
They are heavenly bodies similar in nature.
C.
There are more asteroids than meteoroids.
D.
Asteroids are more mysterious than meteoroids.