A．玻璃、油、大地
B．空气、油、塑料
C．陶瓷、湿木材、橡胶
D．空气、塑料、人体
答案：B
--- Did you telephone Uncle Sam our plan for the Christmas holidays on his farm?
--- Yes, he was happy about our arrival, and he eagerly asked when ______.
A．has we arrived
B．we had arrived
C．were we arriving
D．we were arriving
在涉外交往中，如何做到“入乡随俗”？
