()是一种以书面形式了解被调查对象的反应和看法，并以此获得资料和信息的载体。
A．问卷
B．深度访谈
C．抽样
D．实验控制
参考答案：B
--When did you become a volunteer for the elderly?
-- Two years ago. I ______ this group since then.
A．joined
B．took part in
C．have joined
D．have been in
风邪居于肌肤的临床表现是（）
A.皮肤瘙痒，丘疹
B.咳嗽，鼻塞，恶风微热
C.麻木，口眼斜
D.肢体面目浮肿
E.游走性关节疼痛
