单项选择题

What can we learn from the passage

A．Americans know a lot about international affairs.
B．Friendships among Americans tend to be more formal.
C．Americans always seem to be on the move.
D．Americans like to cooperate with other people.

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单项选择题

According to the passage, Americans' attitude towards friendship is______.

A．unusual to have only one intimate friend
B．more informal than that in other countries
C．to regard all friends as only social acquaintances
D．to divide friends into several grades

单项选择题

The phrase highly charged (Line 2, Para. 2) most probably means______.

A．extremely expensive
B．much cheerful
C．highly responsible
D．full of mobility and change