任意画3条直线，则交点的个数是 [ ]
A．1个
B.1个或3个
C.1个或2个或3个
D.0个或1个或2个或3个
答案：D
in china,the number of cities is increacing________dovlopment is moognined aoman the world.
A．where
B．which
C．whose
D．that
水中总大肠菌群系以100ml水样中所污染的总大肠菌群的[最大可能数（）表示。
