氯化钾静滴浓度不得超过
A．0．1％
B．0．3％
C．0．6％
D．0．9％
E．1．2％
参考答案：B
---Mum, have you seen my U-Disk?
---____________ you bought last Sunday? I'm afraid I haven't seen ________.
A．The one; one
B．That; one
C．One; it
D．The one; it
属于弥散型胎盘的动物是
A．马
B．牛
C．羊
D．犬
E．猴
