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【单选题】

大约 6500 万年前,一颗直径超过 10 千米的近地小行星撞击过地球,这次
撞击直接导致了( )的灭绝。

A.
三叶虫
B.
巨猿
C.
恐龙
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参考答案:
参考解析:
.
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举一反三

【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.

【单选题】下列关于撞击吸收结构的描述中,哪项说法是不正确地?()

A.
它有效地将撞击能量集中到乘员舱
B.
它有效的分散乘员舱上的撞击能量
C.
它靠吸收撞击能量来降低减速度
D.
前后侧梁上均有能量吸收区域