The Kepler space telescope (太空望远镜) has been looking for signs of new worlds outside the Solar System since May 2009, and has so far found more than 4,000 planets. But those planets are either too hot or too cold to sustain life.

　　（注：Kepler Mission NASA 设计的发现类地行星的太空探索任务）

　　1. The following statements about Kepler 452b (Earth 2) are all correct except ________.

　　A. It has existed for six billion years.

　　B. It is 60% larger in diameter than the earth.

　　C. It has already entered an uncontrollable greenhouse period of its climate history

　　D. It is the closest planet to the earth.

　　2. The importance of the discovery of Earth2 lies in the fact that Earth2 ________.

　　① can show a likely future for the earth

　　② gives new hope that alien civilizations may exist beyond the Solar System

　　③ proves that life once inhabited the planet

　　④ proves that plants can survive on other planets apart from the eartth.

　　⑤ is going through now what the earth will undergo more than a billion years from now

　　A. ④⑤

　　B. ①③

　　C. ②④

　　D. ①②

　　3. What can we infer from the text?

　　A. The earth has existed for about 4.5 billion years.

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