第30题: [单项选择]The primary solution to environmental problems is ______. A. to allow market forces to operate properly B. to control consumption of natural resources C. to limit the growth of the world population D. to avoid fluctuations in prices 参考答案:A 答案解析:细节推理题。文章最后一段第一句“It is where prices and markets do not operate properly that this benign trend hegira