2019年公共英语二级模拟题：阅读理解（8）

　　At first sight the planet Mars(火星)does not appear very welcoming to any kind of life. It has very little oxygen and water, the temperature at night is below 50 degrees and winds of 100 miles(161 kilometers)per hour cause severe dust storms. However, the surface of the planet seems to show that water flowed across it at some time in the past, and it is believed that there would be enough ice at the poles to cover the planet with water if it melted. Although there is no life on the Mars now, some scientists think there may have been some form of life a long time ago. At that time, the planet had active volcanoes(火山); the atmosphere was thicker and warmer; and there was water. In fact, in some ways the Mars may have been similar to the Earth, where life exists.

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　　Some people believe that the Mars could support life in the future if the right conditions were produced. The first step would be to warm the planet using certain gases which trap the Sun’s heat in the planet’s atmosphere. With warmth, water and carbon dioxide, simple plants could begin to grow. These plants could slowly make the Mars fit to live on. It is judged that the whole process might take between

　　100, 000 and 200, 000 years. In the meantime, people could begin to live on the planet in a special closed environment. They would provide a lot of useful information about conditions on the Mars and the problems connected with living there.

　　小题1: According to the passage, the planet Mars has no　　　on it.

　　A.windsB.dust

　　C.mountainsD.animals

　　小题2:It is believed that on the Mars now　　　.

　　A.there is a large amount of ice at the poles

　　B.there is a thicker and warmer atmosphere

　　C.there are some kinds of simple plants

　　D.there are many active volcanoes

　　小题3: What is the topic of Paragraph 2?

　　A.Certain gases should be used to warm the Mars.

　　B.Plants should be grown to make the Mars fit to live on.

　　C.The Mars could support life on right conditions in the future.

　　D.People could live on the Mars in a special closed environment.

　　小题4: The most suitable title for the passage is　　　.

　　A.No Life on the Mars

　　B.Study of the Mars

　　C.The Possibility of Life on the Mars

　　D.Future Conditions on the Mars

　　参考答案及解析

　　小题1:D

　　小题2:A

　　小题3:C

　　小题4:C

　　【文章大意】本文主要分析了火星上的现状以及对过去火星历史的推测, 从而展望了未来火星适合人类生存的可能性。

　　小题1:选D。细节理解题。在第一段中的细节中提到了winds, dust storms, volcanoes, 但是没有涉及第四项, 根据there is no life on the Mars now知火星上没有动物生存, 故选D项。

　　小题2:选A。细节理解题。根据第一段中的it is believed that there would be enough ice at the poles to cover the planet with water if it melted. 可知火星的两极有大量的冰, 融化后就会有水, 故A项正确。

　　小题3:选C。主旨大意题。根据第二段的叙述可知主要讲未来在火星上如何创造适合人类生存的条件, 也就是说第一句话为本段的主题句, 故本段主题为C项。

　　小题4:选C。主旨大意题。本文主要分析了火星上的现状以及对过去火星历史的推测, 从而展望了未来火星适合人类生存的可能性, 故C项作为题目合适。