2. 外语
  3. If the population of’ the earth goes on increasing at its present rate, when will we use up all the oil that drives our cars? T

If the population of’ the earth goes on increasing at its present rate, when will we use up all the oil that drives our cars? T

admin2009-06-28  49
问题 If the population of’ the earth goes on increasing at its present rate, when will we use up all the oil that drives our cars?
The key for algae can change the atmosphere of Venus is that ______.
选项 A、algae will not pollute the atmosphere
B、algae can be placed in small rockets
C、algae can break down the carbon dioxide (二氧化碳) into oxygen and carbon
D、algae can live in extremely hot or cold atmospheres
答案C
解析 推理题。从全文可以看出，金星大气的改变是因为藻类把二氧化碳分解成了氧气和碳，使温度下降，而且是氧气产生雨水使大气温度再次下降。所以选c答案。
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