持续房颤最有效的复律手段为（）
A.洋地黄
B.同步直流电复律术
C.导管消融术
D.植入起搏器
E.维拉帕米
参考答案：B
He came home late. You _____him do that, he _______. [ ]
A. shouldn't have let; might have got lost
B. shouldn't let; might get lost
C. shouldn't have let; might get lost
D. shouldn't let; might have got lost
广西湿地主要保护形式有（）、湿地公园、饮用水水源保护区、森林公园、风景名胜区以及其它保护形式的保护。
A.生态保护区
B.基本农田保护区
C.湿地保护区
D.自然保护区
