A.To give us some advice before we travel abroad.B.To offer us some important facts ab

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A.To give us some advice before we travel abroad.

B.To offer us some important facts about handshaking.

C.To introduce us to some different customs in the West.

D.To tell us some differences between the East and the West.

热搜:a是b的充分条件,b是a的必要条件吗