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  3. At the first sight the planet Mars does not appear very welcome to any kind of life. It has very little oxygen and water, the te

At the first sight the planet Mars does not appear very welcome to any kind of life. It has very little oxygen and water, the te

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问题     At the first sight the planet Mars does not appear very welcome to any kind of life. It has very little oxygen and water, the temperature at night is below 50°C and winds of 100 miles per hour cause severe dust storms. However, the surface of the planet seems to show that water flowed across it some time in the past, and it is believed that there is enough ice at the poles to cover the planet with water if it melts. Although there is no life on the Mars now, some scientists think that there may have been some form of life long time ago. At that time, the planet had active volcanoes ; 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(二氧化碳), simple plants could begin to grow. These plants could slowly make the Mars more suitable for living. It is estimated 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 special closed environments. They would provide a lot of useful information about conditions on the Mars and the problems connected with living there.
The author’ s attitude towards the possibility of life on the Mars in the future is______.
选项 A、doubtful
B、positive
C、negative
D、uninterested
答案B
解析 要求判断作者对未来火星上有生命可能性的态度。第一段中作者表明火星上有流水的痕迹，两极有冰，有些科学家认为火星上曾经有生命存在。第二段作者分析了未来火星上生活的可能性。因此可以判断答案为B。
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