The best title for this text is ______. [br] A contributing factor to the greenh

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问题 The best title for this text is ______. [br] A contributing factor to the greenhouse effect is ______.

选项 A、the earth’ s atmosphere
B、the world climate
C、the forest fire
D、the two poles

答案 C

解析本题询问温室效应的一个主要因素是什么。根据原文(37)处可知，二氧化碳的来源之一就是燃烧森林树木，故选C。

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