污水的水质指标包括______。
A．物理性质指标
B．化学性质指标
C．生物学性质指标
D．有机物性质指标
参考答案：A,B,C
---How about your journey to Mount Emei?
---Everything was wonderful except that our car ________ twice on the way.
A．slowed down
B．broke down
C．got down
D．put down
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