分析 人们都知道引起温室气体的因素是二氧化碳,可是科学家发现太阳的活跃也会加重温室效应,这种影响比二氧化碳甚至更明显.
解答 21.D.细节理解题.根据第一段No doubt the tons of carbon dioxide being thrown up into the air are dangerously warming the earth和第二段Some scientists studied the sun and found that when the sun becomes more active,the earth warms up可知,二氧化碳增多和太阳变得更加活跃使地球变得越来越暖.故选D.
22.C.细节理解题.根据第二段中"the sun's changeable moods may be more important than carbon dioxide in warming the earth"可知,太阳的变化会比二氧化碳更严重,故选C.
23.A.细节理解题.根据第三段So in order not to make the earth warming up,what we can do is to control the amount of giving off carbon dioxide可知,为了不使地球变暖,我们能做的就是控制二氧化碳的排放量.故选A.
点评 本篇文章都是细节推理题,答题的已给选项也一般不会和短文相关词语完全相同,需要考生自己理解句子,延伸推理出题目答案,比一般细节理解题偏难.
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