题目

完形填空Do you know many students aren’t healthy today?Now many students know sports are good for____health．But they don’t like playing sports．Some of them only watch them____TV．What’s more, many of them____like watching TV and playing computer games．They often____, “Play soccer? Oh, it sounds____．Play basketball? Oh, It is difficult．”And many boys and girls don’t like____．They don’t have carrots for lunch and they don’t have broccoli for dinner．But vegetables and fruits are____food．They need to eat lots of them every day．____they like junk food．They l9．下列四类函数中，具有性质“对任意的x＞0，y＞0，函数f（x）满足“f（x+y）=f（x）•f（y）”的是（　　）A．幂函数B．对数函数C．指数函数D．一次函数