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As viewed from space, the Earth’s distinguishing characteristics are its blue waters and white clouds. Enveloped by an ocean of
As viewed from space, the Earth’s distinguishing characteristics are its blue waters and white clouds. Enveloped by an ocean of
admin
2006-01-14
54
问题
As viewed from space, the Earth’s distinguishing characteristics are its blue waters and white clouds. Enveloped by an ocean of air consisting of 78% nitrogen and 21% oxygen, the planet is the only one in our solar system known to harbor life. Circling the Sun at an average distance of 149 million km (93 million miles), the Earth is the third planet from the Sun and the fifth largest planet in the solar system. Its rapid spin and molten nickel-iron core give rise to an extensive magnetic field which, coupled with the atmosphere, shields us from nearly all of the harmful radiation coming from the Sun and other stars. Most meteors burn up in the Earth’s atmosphere before they can strike the surface. The planet’s active geological processes have left no evidence of the ancient pelting it almost certainly received soon after it was formed. The Earth has a single natural satellite -- the Moon.
This selection leads one to believe that the Earth ______.
选项
A、never gets hit by meteors
B、always gets hit by meteors
C、was hit by meteors some time in the past
D、may be bombarded by meteors in the near future
答案
C
解析
从Most meteors burn up in the Earth’s atmosphere before they can strike the surface. The planet’s active geological processes have left no evidence of the ancient pelting it almost certainly received soon after it was formed.(大多数的流星在撞击地球表面之前就已在大气层中烧毁,而地球活跃的地质作用使得地球从其形成之时起就没留下以往那些曾遭受撞击的痕迹。)这两句中推知地球在过去还是遭受过流星撞击的,因此C为答案。
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