单项选择题

A．Synthetic fuel.
B．Solar energy.
C．Alcohol.
D．Electricity.
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单项选择题
A．Birds have to be taught to navigate.B．A bird that has been caged will not.C．Some birds cannot fly at night.D．Some birds seem instinctively to follow the stars when flying at night.
A．Birds have to be taught to navigate.
B．A bird that has been caged will not.
C．Some birds cannot fly at night.
D．Some birds seem instinctively to follow the stars when flying at night.
单项选择题
A．A seafood restaurant.B．A very fancy restaurant.C．An exclusive restaurant.D．An Italian restaurant.
A．A seafood restaurant.
B．A very fancy restaurant.
C．An exclusive restaurant.
D．An Italian restaurant.
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