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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.
admin
2010-02-17
30
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.
【C18】
选项
A、before
B、when
C、after
D、unless
答案
B
解析
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0
专业英语四级
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