I need a ____________ runners.[ ]
A. pair
B. pair of
C. pairs of
答案:B
关于三尖瓣闭锁解剖特点的描述,下列不正确的是()。
A.三尖瓣呈闭锁状态
B.右心室发育不良
C.房间隔继发孔缺损
D.主动脉瓣狭窄
E.室间隔膜周部缺损
If you want to sing, you can join the ______. [ ]
A. music club
B. English club
C. chess club
D. art club