单项选择题
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A.They use a map and the memory of location.
B.They use the sun and the stars.
C.They use a map and the earth’s magnetic field.
D.They have precise sense of time or may use the earth’s magnetic field.
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Mention the different functions of caffeine and alcohol.
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单项选择题
A.Mostly English.B.Japanese.C.Chinese.D.Each language about half the time.
A.Mostly English.
B.Japanese.
C.Chinese.
D.Each language about half the time.
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