单项选择题
Why do we need active sleep
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A. To prepare for passive sleep.
B. To rest our body.
C. To stay healthy.
D. To help us rest our minds.
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grammar and vocabulary
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单项选择题
According to the author, the breakthrough of this technology starts firm ______.
A. computer science
B. telecommunication technology
C. phoning services
D. booking technology
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