Ⅰ.阅读理解(共15小题；每小题2分，满分30分)
Knowledge is power. But there is one thing that we must remember. A strong mind needs a strong body in order to make it useful.
There are lots of good exercises. They are helpful and healthy. Many of them may be taken indoors during rainy weather. Indoors exercises, however, are never as helpful as those taken outdoors in fresh air. It is because in fresh air more oxygen (氧气) is taken into our body and more wastes are given off. The air in the house does not remain fresh very long. But outdoors' is usually fresh.
