2. 外语
  3. Contrary to popular belief, "falling stars" are not stars at all, but are meteors, solid bodies that travel through space.

Contrary to popular belief, "falling stars" are not stars at all, but are meteors, solid bodies that travel through space.

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问题      Contrary to popular belief, "falling stars" are not stars at all, but are meteors, solid bodies that travel through space.
     Meteors,【C1】______ in size from that of a pinhead, to many tons, are 【C2】______  to the naked eye at night, when the friction between the 【C3】______ of the meteors and of the air, produces heat【C4】______  the meteors enter the earth’s atmosphere. The intense heat 【C5】______  the meteors, which leave a blazing trail of light in their 【C6】______ .
     Most meteors 【C7】______  when they enter the earth’s atmosphere, 【C8】______  the large meteors, which are dragged through the earth’s atmosphere by theearth’s【C9】______  pull. After successful landings up on the earth, these huge【C10】 ______ Some scientists are renamed meteorites. theorize【C11】______  thousands of meteors fall to the earth during the daytime and the nighttime, but this theory is impossible to prove 【C12】______  to disprove, as most would necessarily land in water,【C13】______  covers most of the earth’s surface.【C14】______  , meteors and meteor particles, except the loners,  travel together in 【C15】______  like bees, and travel  【C16】______  any direction they  【C17】______  Nature’s  spec-tacular fireworks show, a "meteor view shower,"  comes into 【C18】______ the meteors encounter the upper layer of the earth’s atmosphere during the earth’s perpetual revolution 【C19】______ the sun. The friction produced when the meteors and the meteor particles【C20】______  the atmospheric air incinerates  the swarms, and they fall towards the earth in a brilliant display of light.
【C11】
选项 A、what
B、why
C、that
D、whether
答案C
解析 that引导宾语从句时只起连接作用，在从句中不作句子成分，也无具体含义。其他选项不合题意。
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