单选题 The insect population increased due to ______.

【正确答案】 A
【答案解析】[试题分析] 事实推理题。
[详细解答] 全文最后一句中…since the burning hot atmosphere was as favorable to them as it was unfavorable to man and many other animals.虽然这种气候不适合人类和其它动物,但昆虫却很适应,不难推断A为正确答案。