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.