什么叫巷道贯通的允许误差？

When I came in, the children pretended ________ and no one even raised their eyes.

A．to read

B．have read

C．to be reading

D．to have been reading

_____ the society developing very fast, it's quite necessary that we should have a good knowledge of

English and computers. [ ]

A. As        

B. For      

C. With      

D. Since

舌色白如镜者属（）。

A.气虚

B.胃阴虚

C.营血大虚

D.阳气虚衰

E.痰浊未化

下列有关B型超声检查临床意义的叙述，不恰当的是（）。

A.对急性肝炎有诊断意义

B.对肝炎肝硬化有诊断意义

C.对肝癌有诊断意义

D.对肝大块坏死有诊断意义

E.对脂肪肝有诊断意义