They are still very cautious about ________ side effect the new medicine will bring about, although the experts have tried it on about 2000 patients．

A．which

B．that

C．where

D．what

躯干包括（）。

A.胸、背、腰、腹四部分

B.胸、背、腹三部分

C.胸、背、腹、盆四部分

D.胸、背、腰、腹、盆五部分

E.胸、腰、腹三部分