The planets aren’t the only wanderers of the sky. There’re some things even farther and longer. Long after people were no longer afraid of planets, they still thought the comets were bad objects tha 题目和参考答案——青夏教育精英家教网—

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The planets aren’t the only wanderers(漫游者) of the sky. There’re some things even farther and longer. Long after people were no longer afraid of planets, they still thought the comets(彗星) were bad objects that traveled in the sky. They were afraid that the comets would suddenly land on the earth and hurt them.
But, in fact, even if a comet did hit the earth, nothing much happened. A comet is really a harmless （无害的）thing.
Comets have round heads and long tails , and they are very bright. Sometimes they look like heads with long hair flying with them. That’s why they’re called comets. Comet means long-haired.
Like the stars and planets, comets are far away. But we can know its size. The head of a small comet is as wide as the Pacific Ocean. And a big comet’s head is ten times as big as the earth. Its tail is millions of kilometers long. Then why wouldn’t the great big thing hurt us if it hit the earth? Because it isn’t solid. It’s thin like cloud. Its tail is nothing but bright gas. And its head is made of small pieces and they could not hurt the earth.
Some comets can be seen for a few months. Then they go away. Some of them come back in a certain number of years. Some are never seen again.
Perhaps these comets that never return have broken into pieces. For some astronomers think that shooting stars(流星) are pieces of broken comets.
小题1:People were afraid ________.

A．comets are different from planets

B．comets travel in the sky

C．comets are much bigger than the earth

D．comets could hit the earth

小题2:Comets have long tail like ________, so we call them comets.

A．long hair

B．round heads

C．round dishes

D．wide wings

小题3:From the passage we know the tails of comets are made of ________.

A．water

B．solid

C．gas

D．small stones

小题4:The underlined word “astronomers” may mean ________ in Chinese.

A．心理学家

B．艺术家

C．天文学家

D．考古专家

小题5:Which of the following is TRUE ?

A．A comet is a kind of planets.

B．Comets are all ten times as big as the earth.

C．People can hardly see comets.

D．Shooting stars may come from the broken comets.

小题1:D
小题2:A
小题3:C
小题4:C
小题5:D

试题分析：短文大意：这篇短文主要讲述了彗星名称的由来，以及彗星的结构。告诉我们彗星之所以不会撞到地球，是因为彗星是又气体构成的。
小题1:细节理解题。根据短文第一段They were afraid that the comets would suddenly land on the earth and hurt them.描述，可知人们担心彗星会撞击地球。故选D。
小题2:细节理解题。根据短文第三段Sometimes they look like heads with long hair flying with them. That’s why they’re called comets. 描述，可知彗星之所以被称作彗星是因为它们有常常的尾巴。故选A。
小题3:细节理解题。根据短文第四段Its tail is nothing but bright gas. 描述，可知彗星的尾巴是有气体构成的。故选C。
小题4:词义猜测题。结合常识，可知本句话是天文学家的发现，故选C。
小题5:细节理解题。根据短文最后一句话For some astronomers think that shooting stars(流星) are pieces of broken comets.描述，可知流行来自破碎的彗星。故选D。

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