题目内容
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[主观题]
A new study on birds’ sleep has revealed that ________. A) half brain sleep is fou
A new study on birds’ sleep has revealed that ________.
A) half brain sleep is found in a wide variety of birds
B) half brain sleep is characterized by slow brain waves
C) birds can control their half brain sleep consciously
D) birds seldom sleep with the whole of their brain at rest
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