Their teacher was ill, so they sat in  the classroom__________.  [ ]

A. in silent    

B. in silence  

C. silent      

D. silence

干咳，痰少难咳，潮热，盗汗，证属（）

A.肺热壅盛

B.肺阴亏虚

C.痰湿阻肺

D.痰热壅肺

E.燥邪犯肺