具有抗吞噬作用的细菌结构是（）
A.质粒
B.荚膜
C.鞭毛
D.菌毛
E.芽孢
参考答案：B
The policeman asked the man ______ at 9 o'clock last night． [ ]
A. what he was doing
B. what he is doing
C. what was he doing
D. what is he doing
《城镇企业职工基本养老保险关系转移接续暂行办法》规定，参保人员转移接续基本养老保险关系后，符合待遇领取条件的，如何计算其基本养老金？
