A. might cause the overflow of flood B. may lead to the loss of organic nitrogen in it C. will produce a great deal of organic nitrogen D. is harmless to the growth of rain forests 参考答案:B 答案解析:[定位] 第2段倒数第二、三、四句。 [解析] 这三句话表明温度升高会导致大量有机氮的流失。选项B符合原文意思。 [点睛] 选项C正好与原文相反;选项A无法在文中找到依据;选项D与本文最后