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题目内容
（河南科技大学大学英语3(专升本)）
The air in the house does not remain fresh very long. It.s because ______.
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 move at all
D:the house gives off wastes
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 move at all
D:the house gives off wastes
参考答案