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  3. There is a definite possibility that the climate of the world may be changing. Some scientists imagine that this could even mean

There is a definite possibility that the climate of the world may be changing. Some scientists imagine that this could even mean

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问题     There is a definite possibility that the climate of the world may be changing. Some scientists imagine that this could even mean the beginning of another ice age. The effects of such a change in climate on the human population of the world would be startling.
    Recent research suggests that the general warming trend of the past hundred years or so may be coming to an end. During the past ten years, meteorologists tell us the average temperature of the earth has dropped about one degree Fahrenheit. This does not seem like much, but it could have effects on wind and rain patterns which influence the overall weather picture. If these patterns change a lot, it could mean that certain regions of the world may continue to have long droughts while others will possibly suffer from widespread flooding.
    What regulates the climate is not exactly known. Meteorologists believe that clouds may be an important factor in regulating the amount of solar heat held by the earth, which in turn determines the temperature of the planet. Another possibility is that man’ s industrial and agricultural methods may be affecting the natural weather patterns. However, the weather is not understood well enough for scientists to say for certain what is happening to the climate and what side effects this will actually have on the world’ s population.  
According to what you have read, which of the following is TRUE?
选项 A、Man’ s activities have no effect on the climate.
B、Another ice age will come soon.
C、People don’t care about the changing climate.
D、Scientists are not yet sure about the reason for the changing climate.
答案D
解析 推理判断题。选项A“人类活动对气候变化没有任何影响”，这与第三 段第三句“Another possibility is that man’s industrial and agricultural methods may be affecting the natural weather patterns．”不相符；选项B表示新一轮的冰河时代很快会 来临，而文章并未提及冰河时代到来的速度会很快；选项C“人们不在意全球气候的 变化”与文章整体内容不符；根据文章第三段第一句也可知，D项正确。
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