因为 $\frac{7}{2}$ × $\frac{2}{7}$ ＝1，所以（        ）。

选字填空。

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____人飞船        一____蜡烛         量体____衣          ____赃嫁祸

    It's Saturday morning. My parents and I are on a tour bus. There are about twenty people on the bus. Some are from America, and some are from England and Australia. They are all our friends. We are going to the Great Wall. On the bus, there are two Chinese. One is a woman, the other is a man. The woman is good at English. She is talking with us about the Great Wall. The other people are listening to her. They like the Great Wall. They want to see it very much.