单项选择题

A. Too old.
B. Twice a week.
C. 20 kilometers.
D. Two weeks.
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单项选择题
A. At 10:13. B. At 10:30. C. At 10:00. D. At 12:30.
A. At 10:13. B. At 10:30. C. At 10:00. D. At 12:30.
填空题
The brain needs a (continue) ______ supply of blood to work well.
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