我国的《污水综合排放标准》GB8978-1996将排放的污染物按性质及控制方式可分为（）类
A.2
B.3
C.4
D.5
参考答案：A
Playing volleyball is _____. I don't like it. [ ]
A. interesting
B. boring
C. relaxing
D. good
教育教学案例
