关于彗星，你知道多少？
关于彗星，你知道多少？

When you look at the sky at night, you may see a comet(彗星) moving and shining. A comet looks like a star. A comet has no light of its own. It shines with reflecting(反射) sunlight.
Like the earth, a comet goes round the sun, but on a much longer path than the earth travels. A large part of a comet is water frozen into pieces of ice and mixed with iron and rock dust.
An Englishman named Edmund Halley 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 found 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.

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1.A comet shines with reflecting _____.

A moonlight

B sunlight

C water

D gas

解析：选B。B 细节理解题。根据第一段最后一句It shines with reflecting sunlight.可知彗星反射阳光，故选B。

2.Which of the following is NOT a part of a comet?

A Water.

B Iron.

C Bones.

D Rock dust.

解析：选C。C 细节理解题。根据第二段第二句A large part of a comet is water frozen into pieces of ice and mixed with iron and rock dust.可知彗星的很大一部分是冻结在冰中的水，与铁和岩石尘埃混合在一起，故选C。

3.We can see some comets again because__________.

A they move out of our sight

B they have light of their own

C they come close to the sun regularly

D they travel a much longer path around the sun

解析：选C。C 细节理解题。根据第三段 Others keep coming back at regular times.可知有些彗星定期回来，所以我们可以再次看到它们。故选 C。

4.When did Halley’s Comet come back last time?

A In 1835.

B In 1910.

C In 1968.

D In 1986.

解析：选D。D 细节理解题。根据第四段第二句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.哈雷彗星上次靠近太阳和地球是在1986年，故选D。

5.Where can you most probably read the passage?

A In a science magazine.

B In a fairy tale book.

C In a guide book.

D In a science fiction.

解析：选A。A 文章出处题。本文是一篇介绍彗星的科普类说明文，应该出自科学杂志。B(童话故事书)、C(旅游指南)、D(科幻小说)均不符合。故选 A。