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  3. Contrary to popular belief, "falling stars" are not stars at all, but are m

Contrary to popular belief, "falling stars" are not stars at all, but are m

游客2023-11-20  13
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. [br] 【C4】
选项 A、unless
B、before
C、after
D、as
答案 D
解析
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