导游人员在与客人交谈中要（），特别是与境外旅游者接触中更要注意这一点。
A．轻声温和
B．使用敬语
C．察言观色
D．以我为中心
参考答案：B
The reason _____ being late for the meeting was _____ his little son fell ill this morning. [ ]
A. for, that
B. why, that
C. for, because
D. why, because
接地极（earth electrode）
