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

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

单项选择题

It can be inferred from the passage that______.

A．Americans want to take part in all kinds of activities
B．curiosity is the major characteristic of Americans
C．Americans do not know how to deal with silence
D．Americans' characters are influenced by their social and geographical environments