If you look at the sky one night and see something moving and shining that you have never seen before, it might be a comet (彗星).
　　A comet sometimes looks like a star. Like a planet, a comet has no light of its own. It shines from the sunlight it reflects (反射). Like the earth, a comet goes round the sun, but on a much longer path (軌道) than the earth travels.
If a comet isn’t a star, what is it then?
　   Some scientists think that a large part of a comet is water frozen into pieces of ice and mixed with iron and rock dust and perhaps a few big pieces of rock. When sunshine melts (融化) the ice in the comet, great clouds of gas go trailing after it. These clouds, together with the dust, form a long tail.Many people perhaps have seen a comet. However no one knows how many comets there are. There may be millions of comets, but only a few come close enough for us to see.
　　An Englishman named Edmund Halley, who lived from 1656 to 1742, found out a lot about the paths that comets take through the sky. Some comets move out of our sight and never come back. Others keep coming back at regular times. A big comet that keeps coming back was named after Halley because he was the one who worked out when it would come back again. Maybe you have ever seen Halley’s Comets because the last time it came close to the sun and the earth was in the year 1986. Then people all over the world were outside at night to look at it. You will probably be able to see Halley’s Comets when it comes near the earth again.
小題1:A comet is like ________.
A．sunB．moonC．sunlightD．the earth
小題2:A large part of a comet is ______.
A．water and rock
B．water frozen into pieces of ice and mixed with iron
C．ice, iron and rock dust
D．only a few big pieces of rock
小題3:Maybe many people _______.
A．haven’t seen any cometsB．have seen all comets
C．have seen a comet at daytimeD．have seen a comet
小題4:Some comets keep coming back ________.
A．a(chǎn)t any timeB．a(chǎn)t noonC．a(chǎn)t regular timesD．a(chǎn)t daytime
小題5:Halley’s Comets came back _____.
A．in 1990B．in 1980C．in 1986D．in 1989

小題1:D
小題2:C
小題3:D
小題4:C
小題5:C

試題分析：短文大意：本文介紹了有關(guān)彗星的知識。彗星有時(shí)看起來像個(gè)明星。就像一個(gè)行星，一顆彗星本身不發(fā)光。它是在反射陽光。如同地球一樣，彗星繞著太陽轉(zhuǎn)，但它比地球的旅行軌道更長。如果彗星不是一顆恒星，它是什么呢？短文敘述了一些科學(xué)家的觀點(diǎn)。
小題1:細(xì)節(jié)理解題。根據(jù)"Like the earth, a comet goes round the sun, but…"可知選D。
小題2:細(xì)節(jié)理解題。根據(jù)"…is water frozen into pieces of ice and mixed with iron and rock dust and perhaps a few big pieces of rock."這句話即能得出答案C。
小題3:細(xì)節(jié)理解題。由第五段的首句"Many people perhaps have seen a comet."可知選D。
小題4:細(xì)節(jié)理解題。根據(jù)"Some comets move out of our sight and never come back. Others keep coming back at regular times."一句可知選C。
小題5:細(xì)節(jié)理解題。哈雷彗星每七十六年才能看到一次。再結(jié)合"…the last time it came close to the sun and the earth was in the year 1986."這句話的意思，即可得到答案C。
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