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 sight 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(yuǎn)鏡）towards the planet and search for radiation（放射）. By studying the radiation, scientists would find out about the chemicals（化學(xué)物質(zhì)）around the planet and discover it Gliese 581g has an atmosphere. If it has one, studying the atmosphere would give us a good idea if 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.
小題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.
小題2:According to the article, Gliese 581g ________.
A．is at the right distance from its starB．moves around the earth
C．is as far away from us as the moonD．can be reached in about 220 years
小題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
小題4:Which of the following is the best title for the passage above?
A．Gliese 581g, a Likely Living PlanetB．Gliese 581, a Likely Living Planet
C．Gliese 581g and Its StarD．Gliese 581g and Radiation

小題1:A
小題1:A
小題1:C
小題1:A
【主旨大意】科學(xué)家在2010年9月發(fā)現(xiàn)了一個(gè)帶有生命跡象的球體，然后介紹了它與地球的距離以及尋找生命的方法。
小題1:細(xì)節(jié)理解。第一段第一句：科學(xué)家發(fā)現(xiàn)了一顆存在生命的行星。
小題1:細(xì)節(jié)考查。從第四段可知：the planet is at the right distance from its star.
小題1:整體理解。本段主要介紹尋找Gliese 581g上面生命的方法。
小題1:整體理解。Gliese 581g是一個(gè)充滿生命的球體。
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