单项选择题

A．It should be made of metal.
B．It should be durable, distinct, divisible and portable.
C．It had been 2,000 years old.
D．It should be made of high-quality materials.
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单项选择题
A．Strip-cities.B．Transportation of the future.C．Energy conservation.D．Advantages of air transportation over railroads.
A．Strip-cities.
B．Transportation of the future.
C．Energy conservation.
D．Advantages of air transportation over railroads.
单项选择题
A．To check out some books from the library.B．To apply for a new library card.C．To return some business books.D．To find out where the art books are located.
A．To check out some books from the library.
B．To apply for a new library card.
C．To return some business books.
D．To find out where the art books are located.
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