单项选择题

A) How do you do C) You are right.
B) Yes, but why D) Really

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单项选择题
The researchers were surprised to find that______.
A. people sleep soundly while they dream
B. dream memories are often incomplete
C. sleepers fidget while dreaming
D. dreamers can record their own dreams
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( )水量 ( )煮时要高温
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