Question

After spending years searching for a planet with life, scientists may have found one. In September 2010, a team of US scientists discovered an Earth-sized planet called Gliese 581g. It has a surface temperature neither too hot nor too cold for liquid（液態(tài)）water. Scientists think there is a chance that the planet could have life.

The planet Gliese 581g goes around a star called Gliese 581, which is about 20 light-years from Earth. That is about 194 trillion（萬億）kilometres －500 million times farther away from us than the moon.

A spacecraft traveling at a one-tenth of the speed of light would reach Gliese 581g within about 220 years. A human can’t live that long, but robotic explorers could make the job easier. However, our fastest spacecraft don’t come anywhere near that one-tenth light-speed mark.

At present, scientists don’t know what the surface might be like on Gliese 581g. What they know is that the planet is at the right distance from its star to have liquid water. It’s also at the right distance to have an atmosphere that could protect the water if it is on the surface.

Although spacecraft won’t be getting there anytime soon, one way to look for life on Gliese 581g is to turn our radio telescopes（望遠鏡）towards the planet and search for radiation（放射）. By studying the radiation, scientists would find out about the chemicals（化學物質）around the planet and discover if Gliese 581g has an atmosphere. If it has one, studying the atmosphere would give us a good idea whether the planet has life or not. But it’ll probably be many years before we can do this properly.

People have been arguing about whether there is alien life on Gliese 581g. Any discussion about alien life is just guessing at this point, according to its discoverers.

1.What did scientists find in September 2010?

A．A planet with water.                     B．A planet similar to the earth.

C．A planet without life.                     D．A planet near the earth.

2.According to the article, Gliese 581g ________.

A．is at the right distance from its star          B．moves around the earth

C．is as far away from us as the moon           D．can be reached in about 220 years

3.Paragraph 5 is mainly about ______.

A．the possibility of living on Gliese 581g

B．the kinds of chemicals around Gliese 581g

C．the way of looking for life on Gliese 581g

D．the aim of studying the radiation on Gliese 581g

4.Which of the following is the best title for the passage above?

A．Gliese 581g, a Likely Living Planet           B．Gliese 581, a Likely Living Planet

C．Gliese 581g and Its Star                   D．Gliese 581g and Radiation

 

Answer 1

【答案】

1.A

2.A

3.C

4.A

【解析】

試題分析：這篇文章主要講的是科學家在2010年9月發(fā)現(xiàn)的一顆非常類似地球的行星Gliese 581g。

1.細節(jié)題。根據(jù)文章In September 2010, a team of US scientists discovered an Earth-sized planet called Gliese 581g. It has a surface temperature neither too hot nor too cold for liquid（液態(tài)）water.可知，2010年9月，科學家發(fā)現(xiàn)了一個表面存在液態(tài)水的行星。故選A

2.細節(jié)題。根據(jù)文章What they know is that the planet is at the right distance from its star to have liquid water.可知，gliese 581g行星位于紅矮星gliese 581的“適居帶”Goldilocks zone量程內。故選A

3.細節(jié)題。文章第五段主要講的是在行星Gliese 581g上尋找生命的方法。故選C

4.主旨題。這篇文章主要講的是科學家在2010年9月發(fā)現(xiàn)的一顆非常類似地球的行星Gliese 581g。故選A

考點：科普類說明文

點評：本文的思路清晰，結構明確。首先對作者所說明的事情進行理解。本文細節(jié)題很多，對于細節(jié)題，學生在理解全文的基礎上要對題目中關鍵字在文章中迅速定位，找到相對應的出處，答題比較備選答案的區(qū)別及和文章信息最相關的是哪個，即那個就為正確答案。