第一代头孢菌素特点中无（）。
A.对G+菌作用强
B.对G-菌所产生的β内酰胺酶不稳定
C.对青霉素稳定
D.肾毒性低
参考答案：D
With the guide________the way,we finally got to the village which we were looking for.[ ]
A．led
B．leading
C．to lead
D．had led
什么是旅游行政处罚其依据是什么
