细菌对磺胺类易产生耐药性，下列哪种细菌对磺胺药最易产生耐药性（）
A.钩端螺旋体
B.葡萄球菌
C.链球菌
D.巴氏杆菌
E.芽孢杆菌
参考答案：B
.Europe has achieved more in controlling the AIDS virus than Asia in the past ten years, _________ the number of people infected with the virus is going up sharply.
A．when
B．that
C．so that
D．where
投递的基本方式有（）。
A.按址投递
B.按区投递
C.按时投递
D.局内投交
E.按片投递
