右图是反射弧的结构示意图，有关叙述错误的是

白天气温较夜晚高的原因是太阳辐射为近地面大气的直接热源．（判断对错）

It's important for us to be healthy. But how can we keep healthy? First,you should eat fruit and vegetables three or four times a week. Then eat some tofu every day because it's good for people, both the young and the old. Milk is also necessary(必要的），especially for women. So you should have milk twice a day. It can help you to be strong. Next, doing more exercise is better. You can do morning exercises or evening exercises. After supper you should take a walk.