单项选择题

A. His home address. B. His work unit address.
C. His email address. D. His cable address.
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单项选择题
What does a recent research by Jeffrey Ellenbogen and his colleagues of Harvard Medical School reveal
A. Brain waves become slow and organized when we sleep.
B. We can measure brain waves during sleep.
C. A person’s brain can block the negative effects of sounds.
D. Sound sleepers show a distinct pattern of spontaneous brain rhythms.
单项选择题
A. Beginner. B. Lower intermediate. C. Upper intermediate. D. Advanced.
A. Beginner. B. Lower intermediate.
C. Upper intermediate. D. Advanced.
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