用来定义事件的关键字是（）。
参考答案：event
Before Father moved off, he would tell me that I should _______ the school rules and regulations. [ ]
A. observe
B. consider
C. overcome
D. convince
下面四个选项中波长最长的是哪一个（）
A.无线电波
B.紫外线
C.可见光
D.红外线
