已知数列{an}的各项均为正数，其前n项和是Sn，若[log2an]是公差为-1

（）不是输卵管结扎术的适应症。

A.已婚、已生育要求绝育者

B.心脏病患者心功能2级以上

C.神经类型不稳定

D.第二次剖宫产时

E.正常分娩产后

违反《动物防疫法》的规定，导致动物疫病传播、流行等，给他人人身、财产造成损害的，依法承担（）.

A.刑事责任

B.民事责任

C.赔偿责任

D.行政责任

为上联“心平浪静，秋月芙蓉湘水碧”选择下联，最合适的一项是         [ ]

A．志远天高，春风杨柳麓山青     

B．情深海阔，夏日荷花潇江红     

C．气壮山威，鲲鹏展翼楚云飞     

D．身正才卓，冬雪松竹衡岳高

职业道德活动中做到表情冷漠、严肃待客是符合职业道德规范要求的（）

Financial derivatives contribute to market completeness because:()

A. the market with financial derivatives allows traders to more exactly shape the risk return characteristics of their portfolios. 

B. it is a market in which the owner of an option has the right to purchase the underlying good at a specific price, and this right lasts until a specific date. 

C. it is a market in which any and all identifiable payoffs can be obtained by trading the securities available in the market.