健脾丸中清热的药是（） A.大黄 B.黄连 C.黄柏 D.黄芩 E.栀子

It is reported that many anew house ____   at present in the disaster area.   [ ]

A. are being built    

B.were being built    

C. was being built    

D. is being built

初乳中含量最多的抗体是（）

A.分泌型IgA 

B.IgG 

C.IgM 

D.IgE 

E.IgD

前自喉结以下至第3肋间分左右支；后自第4、5颈椎至第5胸椎的器官是（）

A.心

B.肺

C.肝

D.食管

E.气管及支气管

They told us it was the second time that the volunteers _______ the nursing home.

A．visited

B．have visited

C．were visiting

D．had visited

（）可在给定位置面出带有中心线的轴和孔。