你(Li Yuan)和几个朋友约定明天在人民公园野餐。你们的朋友Peter也应邀参加。你给他写封信，内容包括：
(1)说明野餐目的。
(2)说明路线。
(3)说明日期、时间。

A．I should give him nothing.
B．Tom liked the gift very much.
C．I should buy him a bottle of champagne.
D．I would make the champagne shower everybody.

A．even Americans are surprised at the big differences among themselves
B．there are many differences in character in different parts of the USA
C．there are many reason for the differences
D．stereotypes about people are not necessarily true