【題目】We live on Earth. 【1】 Think about this, what if we lived on the other planet? Several years ago, many people believed we could live on Mars. 【2】 Let’s compare them and think about which planet is more suitable to live on.

The temperature on the surface of Mars is -73℃—20℃. 20℃ is suitable for humans, and -73℃ is near the average temperature of the Antarctic (南極), 【3】 And we have made a real trip to Mars. It would take 6 months to fly to Mars by spaceship. However, 【4】 Of course, humans can live through this by living in buildings, where plants could be grown and used to produce oxygen.

Scientists said that Kepler-452b is an Earth-like planet. Because it is only about 1.5 times the diameter of Earth, circling a star very much like our own Sun Although we don’t know if we can live there, it lies on the right distance where water could exist (存在). 【5】 But it is too far from us. Using present technology, it would take 25.8 million years to get there. So far, we’ve no hope of getting there.

A. so temperature isn’t a problem on Mars.

B. But until recently, a planet- Kepler452 b has been found by NASA (美國家航空航天局).

C. And water is important to lives on Earth.

D. But our Earth is becoming more and more crowded and polluted.

E. Mars is made up of 95% carbon dioxide, which is not suitable to humans.

【答案】

【1】D

【2】B

【3】A

【4】E

【5】C

【解析】

本篇文章難度適中，主要講述通過和其他的星球?qū)Ρ�，到目前為止，只有地球才最適合人類居住。

【1】根據(jù)Think about this, what if we lived on the other planet?可知，空處表示“我們的地球變得越來越擁擠而且污染越來越大”，所以想到這些，假如住在其他星球會(huì)怎么樣？故選D。

【2】根據(jù)Several years ago, many people believed we could live on Mars以及Let’s compare them and think about which planet is more suitable to live on可知，一些人相信我們可以住在火星上，直到最近，美國國家航空航天局又發(fā)現(xiàn)了開普勒452b，所以下文開始比較哪個(gè)星球更適合居住，故選B。

【3】根據(jù)The temperature on the surface of Mars is -73℃—20℃. 20℃ is suitable for humans, and -73℃ is near the average temperature of the Antarctic可知，講的是溫度，20度適合人類，-73度是南極的溫度，所以在火星上，溫度不是問題。故選A。

【4】根據(jù)Of course, humans can live through this by living in buildings, where plants could be grown and used to produce oxygen可知，種樹來生產(chǎn)氧氣，所以火星上95%都是二氧化碳，故選E。

【5】根據(jù)it lies on the right distance where water could exist可知，表示水是很重要的，故選C。

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