画出球阀的代表符号。
参考答案:
如图E-111所示。
经常酗酒,最直接受到伤害的消化器官是( )
A.口腔
B.胃
C.小肠
D.大肠
----Where ________ my CDs?
----__________in the drawer?
A. are; Are they B. is; Are they C. are; They are