单项选择题

A．Seasonal variations in nature.
B．How intelligence changes with the change of seasons.
C．How we can improve our intelligence.
D．Why summer is the best season for vacation.
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单项选择题
A．A man.B．A woman.C．A man and a woman.D．Two men.
A．A man.
B．A woman.
C．A man and a woman.
D．Two men.
单项选择题
A．Because they pollute air.B．Because they are natural hazards.C．Because they are increasing in numbers.D．Because people don’t walk so often.
A．Because they pollute air.
B．Because they are natural hazards.
C．Because they are increasing in numbers.
D．Because people don’t walk so often.
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