设立全国性商业银行注册资本最低限额为( )元。
A．十亿
B．二十亿
C．三十亿
D．四十亿
参考答案：A
He works as an engineer now, but he _____ on a farm for three years.
A．has worked
B．worked
C．was working
D．had worked
下列检查均可用于霍乱的诊断除外（）
A.大便悬滴法检查
B.大便碱性蛋白胨水培养
C.大便涂片革兰染色
D.霍乱血清凝集试验
E.血培养找霍乱弧菌
