单项选择题

A．An Indian summer brings warm days and nights.
B．An Indian summer occurs only in October.
C．An Indian summer is an annual phenomenon.
D．An Indian summer lasts many weeks.
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单项选择题
A．Synthetic fuel.B．Solar energy.C．Alcohol.D．Electricity.
A．Synthetic fuel.
B．Solar energy.
C．Alcohol.
D．Electricity.
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.
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