抗原能刺激机体产生（）反应。
A、特异性免疫
B、补体
C、非特异性免疫
D、溶解素
参考答案：A
— The research on the new bird flu virus vaccme is challenging and demanding. Who do you think
can do the job?
— _____ my students have a try? [ ]
A. Shall
B. Must
C. Will
D. May
进口设备关税的计税基础是指 ______。
A．装运港船上交货价
B．离岸价
C．到岸价
D．目的港交货价
