Section C

　　When you look up at the night sky, what do you see? There are other(27)_____bodies out there besides the moon and stars. One of the most(28)_____of these is a comet.

　　Comets were formed around the same time the Earth was formed. They are(29)_____ice and other frozen liquids and gases.(30)_____these “dirty snowballs” begin to orbit the sun, just as the planets do.

　　As a comet gets closer to the sun, some gases in it begin to unfreeze. They(31)_____dust particles from the comet to form a huge cloud. As the comet gets even nearer to the sun, a solar wind blows the cloud behind the comet, thus forming its tail. The tail and the(32)_____fuzzy atmosphere around a comet are(33)_____that can help identify this(34)_____in the night sky.

　　In any given year, about a dozen known comets come close to the sun in their orbits. The average person can’t see them all, of course. Usually there is only one or two a year bright enough to be seen with the(35)_____eye. Comet Hale-Bopp, discovered in 1995, was an unusually bright comet. Its orbit brought it(36)_____close to the Earth, within 122 million miles of it. But Hale-Bopp came a long way on its earthly visit. It won’t be back for another four thousand years or so.

　　27.【题干】_____

　　【答案】heavenly

　　【解析】

　　28.【题干】_____

　　【答案】fascinating

　　【解析】

　　29.【题干】_____

　　【答案】made up of

　　【解析】

　　30.【题干】_____

　　【答案】Now and then

　　【解析】

　　31.【题干】_____

　　【答案】combine with

　　【解析】

　　32.【题干】_____

　　【答案】generally

　　【解析】

　　33.【题干】_____

　　【答案】characteristics

　　【解析】

　　34.【题干】_____

　　【答案】phenomenon

　　【解析】

　　35.【题干】_____

　　【答案】naked

　　【解析】

　　36.【题干】_____

　　【答案】relatively

　　【解析】

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