接种疫苗来预防传染病的做法属于 [ ]
A 、控制传染源
B 、切断传播途径
C 、保护易感人群
D 、以上都对
答案：C
--- What do you think of teaching, Bob?
--- I find it and challenging. It is a job you are doing something serious but interesting.
A．funny, that
B．fun, that
C．fun, where
D．funny, which
运动性构音障碍的分类包括（）
A.痉挛型构音障碍
B.迟缓型构音障碍
C.失调型构音障碍
D.运动过强型构音障碍
E.运动过弱型构音障碍
