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【单选题】
引起心衰最常见的诱因是A.
感染
B.
心律失常
C.
输液速度过快
D.
手术
E.
妊娠
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A.
With email, you only deal with its message on your own time.
B.
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C.
It's an interactive conversation.
D.
Email isn't designed for convenience.
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【单选题】The chances of the physical sciences being subject to great changes are the biggest because ______.
A.
contradictory theories keep emerging all the time
B.
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C.
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D.
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【单选题】The chances of the physical sciences being subject to great changes are the biggest because
A.
contradictory theories keep emerging all the time
B.
new information is constantly coming in______.
C.
our knowledge of it is highly insecure
D.
only a very small sample of it has been observed
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