题目

A new study shows that rising levels of planet-warming gases may reduce important nutrients(营养物质)in food cropsResearchers studied the effects of carbon dioxide on rice. In the experiment， scientists grew 18 kinds of rice in fields in China and Japan.They set carbon dioxide levels to what scientists are predicting for our planet by the end of the century.Rice grown under high carbon dioxide conditions had，on average，13 to 30 percent lower levels of four B vitamins and 10 percent less protein(蛋白质)The crops also had 8 percent less iron and 5 percent less zinc than rice grown u下列过程或现象与盐类水解无关的是 A．纯碱溶液去油污 B．加热稀醋酸溶液其pH 稍有减小 C．明矾净水 D．浓的硫化钠溶液有臭鸡蛋气味