为了防止这类交通事故不再发生，我们加强了交通安全的教育和管理。
参考答案：
解析：为了防止这类交通事故再次发生，我们加强了交通安全的教育和管理。
单词填空。
1. The doctor is _________ (执行) an operation now.
2. He expressed it in the _________ (形式) of music.
3. They started to play their own _________ (乐器) and write their own songs like
a real band.
4. I gave up because I didn't have any _________ (自信心) in myself.
5. Increasing numbers of people are _________(敏感的) to pollen (花粉).
6. After the lunch we parted, so I didn't know what happened to him a_________.
7. The boy sings so well that he dreams of being a m_________ tomorrow.
甲型H7N9流感病毒的直径大约为0.0000000081米，用科学记数法表示为 ．
