The two hazards are asteroids and comets. If either travels through Earth’s atmosphere, it is called a meteor; if it lands on Ea

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问题 The two hazards are asteroids and comets. If either travels through Earth’s atmosphere, it is called a meteor; if it lands on Earth’s surface, it is a meteorite.

选项 A、accident
B、superstition
C、muddle
D、danger

答案D

解析 句意:有两种危险的事物——小行星和彗星,不管哪一个闯入地球的大气层,都称为流星,如果落在地面上,则成为陨石。hazard(危险);danger(危险);accident(意外);superstition(迷信);muddle(混乱)。所以选项D为答案。
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