单项选择题

A. $80. B. $60.
C. $100. D. $120.
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According to Rapoport, people fail to fully realize the importance of sleep.
单项选择题
A. The cost of a single language for global communication is heavy. B. Careful analysis by the higher education agencies and the governors is necessary to reduce its cost. C. Great contributions have to be made by the public to reduce the cost. D. Students should have a clear eye to find out which language to learn.
A. The cost of a single language for global communication is heavy.
B. Careful analysis by the higher education agencies and the governors is necessary to reduce its cost.
C. Great contributions have to be made by the public to reduce the cost.
D. Students should have a clear eye to find out which language to learn.
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