Knowledge is power. But there is another thing we must remember. An intelligent mind needs a strong body to make it most useful.

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问题     Knowledge is power. But there is another thing we must remember. An intelligent mind needs a strong body to make it most useful.
    There are a great many good exercises for building up our bodies. Many of them may be done indoors in rainy weather. Indoor exercises, however, are never as helpful as those taken out of doors because in the open air there is more oxygen. The air in the house is not fresh. But out of doors it is very fresh, especially in the morning.
    But what shall we play? There are a number of games such as football, basketball, races... Any game with plenty of exercises is good.
    Do not neglect(忽略) your health. It is of as much importance as your mind. Our country now needs people with creative minds, good judgement, and healthy bodies.
The air in the house does not remain fresh very long. It’s because ______.

选项 A、the fresh air can’t come into the house
B、there is only a little fresh air coming in and a little waste going out
C、the air in the house can’t remain fresh
D、the house gives off wastes

答案B

解析 根据常识判断,室内空气不新鲜是由于不流通所致。
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