中高层住宅是指（）。
A.7～9层住宅
B.10～11层住宅
C.11～12层住宅
D.12～16层住宅
参考答案：A
---___________ everyone present at the meeting? ---No, all but one _________ there.
A．Was; was
B．Were; were
C．Was; were
D．Were; was
寡头垄断厂商都面对一条折弯的需求曲线。
