下列关于青霉素的叙述正确的是（）

A.耐青霉素酶

B.对G菌作用强

C.易引起过敏反应

D.杀菌力弱

E.毒性大

　　　 there were too many stones on the roads, the soldiers (战士) walked to Lushan County in Ya’an Earthquake.

A．If

B．And

C．So

D．Although