教室里坐在不同位置上的同学都能看到黑板上的粉笔字，主要是由于光发生了 （　　）

A．直线传播

B．镜面反射

C．折射

D．漫反射

看图完成对话，一空一词。

John: Hi, Tom!  It's me.  Don't  you  _ 1_  me?                

Tom: Oh. hi, John. How are you?

John: Fine.  Do you remember we   _2_   to the West Lake last year?

Tom: Yes. You used to  _3 _ boating, didn't you?

John: Yeah. You were more   _4 _  in swimming.

Tom:  But now I play soccer.

John: Wow!You sure    _5 _  .

1.____    2.           3.___      4. ___      5. ____