小题1:We were talking on the phone and then the line went dead      .  (突然)

小题2:If        die, life is a broken winged bird that can not fly. (梦想)

小题3:My cousin will celebrate his         birthday with his classmates at his college. (二十)

小题4:How would you          colour to a blind person? (解释)

小题5:One of the keys to         business is careful planning. (成功的)

小题6:We ought to learn to take care of         after entering the high school. (we)

小题7:I have written all the         names on this piece of paper. (win)

小题8:To lose one's life is a tragedy, but to lose one's soul is even      . (bad)

小题9:The teahouse is a popular place for local people to treat their important        .  (visit)

小题10:Her father arranged for her to have an       on her brain. (operate)

某公司没有发行优先股，年营业收人为500万元，变动成本率为40％，经营杠杆系数为1．5，财务杠杆系数为2。如果固定性经营成本增加50万元，那么，联合杠杆系数将变为（）。

A.2.4

B.3

C.6

D.8