单项选择题

The expression "in convoy" (Line 3, Para. 4) is closest in meaning to"______"

A．in line
B．in defence
C．side by side
D．next to one another
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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.
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
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