单项选择题

One out of five bridges in the United States is outmoded.（）

A．incessant
B．intimate
C．obsolete
D．concrete

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单项选择题

Giant horned dinosaurs like triceratops were probably among the favorite prey of the ferocious Tyrannosaurus rex.（）

A．fierce
B．gigantic
C．prehistoric
D．piyeous

单项选择题

You must be tired, but try to hang on till all the works finished．（）

A．stop working
B．keep working
C．wait
D．rest

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