导游人员要有效地对旅游者进行劝说必须（）
A.以情动人
B.以理服人
C.让其诉说
D.给其尊严
E.适度幽默
参考答案：A, B, C, D
The old professor travelled from one school to another, _______ first-hand information about
the education situation in China. [ ]
A. to gather
B. collecting
C. getting together
D. to get together
钛白粉(二氧化钛含量在80%以上)
