Such poets as Shakespeare _____ well-known, of whose works, however, some _____

difficult to understand.[ ]

A. are; are    

B. is; is    

C. are; is  

D. is; are

咽后脓肿切开排脓的正确体位是（）

A.坐位

B.仰卧位

C.侧卧位

D.俯卧位

E.仰卧低头位