监测城市污水应在（）处设采样点。
A、排污渠道
B、进水口?
C、总排污口
D、积蓄污水处
参考答案：B
将一盆栽植物横放于地，则其水平方向的主根近地一侧生长素浓度变化的曲线为(图中虚线表示对根生长既不促进也不抑制的生长素浓度)[ ]
A．
B．
C．
D．
—How about ______ in the river with us —Sorry, I can't. My parents often tell me ______ that.
A. swim; don't do B. swim; to doC. swimming; not do D. swimming; not to do
