Who's _____________ best friend? [ ]
A. you
B. your
C. we
答案:B
—Do you regret bringing up your opinion at the meeting?
—No.________, I think it is very necessary. [ ]
A. On the contrary
B. First of all
C. On the other hand
D. In a word
由少数几家企业控制的市场结构是( )。
A.寡头垄断
B.完全垄断
C.完全竞争
D.垄断竞争