题目

When I walked into the classroom, the teacher was handing in the tests. I was feeling very nervous. I had not studied 1.________ at all at the weekend as I had thought it would be easy test. 2.________ I went through the test for many times but I could only answer 3.________ three out from the twenty questions. I did not want to fail 4.________ the exam. Then, I put my book under my desk, opening it 5.________ and started looking for the answer. The teacher wasn’t 6.________ looking at me, but I copied something. Suddenly, I felt a hand 7.________ on nay shoulder! The teacher c5.声音在空气中的传播情况如下表. 路程/m 340 680 1020 1360 时间/秒 1 2 3 4请根据表中的数据写出三个不同的比例.
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