单项选择题

A．Children Literature.
B．American Literature.
C．Medicine.
D．Elementary Education.
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单项选择题
A．Protection of intellectual property.B．To say no to piracy.C．Luxury items and their prices.D．People and pirated products.
A．Protection of intellectual property.
B．To say "no" to piracy.
C．Luxury items and their prices.
D．People and pirated products.
单项选择题
The passage gives a general description of the benefits and potential problems of a hydrogen economy.
A．Y
B．N
C．NG
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