閱讀下面短文，把方框中的句子還原到文中，然后完成第五小題。（每題1分，共5 分）
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.  ____小題1:____ 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. ____小題2:______ These clouds, together with the dust, form a long tail.
Many people perhaps have seen a comet. _____小題3:_____ .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.  ______小題4:____  . 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.
A. However no one knows how many comets there are.
B. Some comets move out of our sight and never come
C. Like a planet, a comet has no light of its own.
D. When sunshine melts (融化) the ice in the comet, great clouds of gas go trailing after it.
小題5:Which of the following is not true?
A．A large part of a comet is ice, iron and rock dust
B．Some comets keep coming back at any time
C．Halley’s Comets came back in 1986
D．Maybe many people have seen a comet

小題1:C
小題2:D
小題3:A
小題4:B
小題5:B

試題分析：這篇短文主要介紹了彗星的組成部分，為什么叫做彗星。彗星有一部分會移出我們的視線再也不回來，但又有一部分會定期回來像哈雷彗星。
小題1:根據(jù)后文It shines from the sunlight it reflects (反射)可知彗星像行星一樣本身不發(fā)光。故選C。
.小題2:根據(jù)后文These clouds, together with the dust, form a long tail.可知這些云加上塵埃形成長長的尾巴�？芍衔臅岬皆频男纬晒蔬xD。
小題3:上文許多人可能見過彗星。根據(jù)句子的轉(zhuǎn)折詞.However，可知與上文發(fā)生轉(zhuǎn)折。故選B。
小題4:根據(jù)后文Others keep coming back at regular times. 其他的彗星會定期回歸可知前文再說一些彗星。故選B。
小題5:是非判斷題。根據(jù)Others keep coming back at regular times.可知彗星會定期回歸。故B項是錯誤的。
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