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【多选题】
消息蕴含 ，消息是 的， 是消息的载体。A信息 B信号 C具体 D 抽象A.
A
B.
B
C.
C
D.
D
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A.
that
B.
which
C.
where
D.
how
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【简答题】There are a few ways to improve your concentration.____________________________________________