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

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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
单项选择题
Some physicists have proposed that sunspots and solar wind have negligible effects on the earths weather.（）

A．undetermined
B．insignificant
C．unusual
D．indisputable
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