综合填空。根据短文内容和提示，填入所缺单词。（每空0.5分，共5分）

It is important to keep ourselves healthy. If you are healthy, you may enjoy a better【小题1】 (生活). How can we keep healthy? Here is some【小题2】 [əd'vais]:

First, you need to have healthy小题1: (饮食) habits. Breakfast gives you energy for the morning. So don’t go to school w小题2: it. Eating more fruit and vegetables are【小题5】  for our health. Second, playing sports can also help you keep f小题3:. But try to stay【小题7】 [seif] when you play them. Third, try to be happy.【小题8】 (幸福) is important for our health. Fourth, you must stay away from s小题4: and drinking. Because they may cause many illnesses. There are many【小题10】 to keep healthy. If you want to be, you will be.

在空间隔离距离不少于（）时，玉米单交制种纯度较高。

A、200m

B、300m

C、400m

D、100m