第11题: [单项选择]Which of the following environmental problems is the article talking about A. Acid rain. B. Ozone depletion. C. Deforestation. D. The greenhouse effect. 参考答案:D 答案解析:[分析] 综合判断题。文章第一句同时提论A、B、C、D四个选项,但通篇谈论气温的变化对工农业的影响,第四段开头明确提到greenhouse warming,因此D选项为正确答案。