当光的波长不同，我们所看到光的颜色（）。
A、相同
B、不同
C、不一定
D、不变
参考答案：B
Written in a hurry, ____. How can it be satisfactory? [ ]
A. they find many mistakes in the report
B. lots of mistakes have been made in the report
C. there are plenty of mist akes in the report
D. the report is full of mistakes
污水处理场所加的药剂分别有（）、（）。
