题目

Do you think that living a hungry life is last century’s story? Well, it may be this century’s headline. The world has growing worries about a global food shortage. Right now, there are still 870 million hungry people in the world, according to a survey of the UN’s Food and Agriculture Organization. Children can’t escape this, either. Around fifteen million children die of hungry each year. What’s causing food shortages? There are several reasons. There are now more droughts and floods. This is very harmful to farmers and their ability to grow food. Besides, with the growing 16．a、b、c三种物质的溶解度曲线如图所示．现有t1℃时的a、b、c三种物质的饱和溶液，将其都升温至t2℃时，下列说法错误的是（　　）A．a溶液中的溶质质量分数最大B．c溶液中的溶质质量分数最小C．b溶液为不饱和溶液D．c溶液中有晶体析出