The best title for this text is . The greenhouse effect we are experiencing now resulted from .

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问题 The best title for this text is ______.
The greenhouse effect we are experiencing now resulted from ______.

选项 A、the present environmental pollution
B、the poisonous gases produced 40 years ago
C、the development of industry
D、the wastes dumped by people

答案B

解析本题询问目前我们所感受的温室效应是由什么导致的。根据原文(38)处可知，现在全球变暖是20世纪60年代人们投入到大气里的二氧化碳和其他气体导致的结果，故选D。

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大学英语三级A级

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