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.

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.

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

A. windsB. dust

C. mountainsD. animals

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

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.

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

 

1.D

2.A

3.C

4.C

【解析】

【文章大意】本文主要分析了火星上的現(xiàn)狀以及對(duì)過去火星歷史的推測(cè), 從而展望了未來火星適合人類生存的可能性。

1.選D。細(xì)節(jié)理解題。在第一段中的細(xì)節(jié)中提到了winds, dust storms, volcanoes, 但是沒有涉及第四項(xiàng), 根據(jù)there is no life on the Mars now知火星上沒有動(dòng)物生存, 故選D項(xiàng)。

2.2】選A。細(xì)節(jié)理解題。根據(jù)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. 可知火星的兩極有大量的冰, 融化后就會(huì)有水, 故A項(xiàng)正確。

3.3】選C。主旨大意題。根據(jù)第二段的敘述可知主要講未來在火星上如何創(chuàng)造適合人類生存的條件, 也就是說第一句話為本段的主題句, 故本段主題為C項(xiàng)。

4.4】選C。主旨大意題。本文主要分析了火星上的現(xiàn)狀以及對(duì)過去火星歷史的推測(cè), 從而展望了未來火星適合人類生存的可能性, 故C項(xiàng)作為題目合適。

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