结核引起机体的免疫是
A．抗菌免疫
B．带菌免疫
C．局部免疫
D．抗毒素免疫
E．抗菌免疫及抗毒素免疫
参考答案：B
—How do you spend your weekends?
—At weekends I prefer _______ at home to _______ out.
A．staying, going
B．stay, going
C．staying, to
D．to stay, go
安全防卫中的打靶练习分为打固定靶和活动靶两种（）
