单项选择题

A．Middle-aged and elderly people.
B．Young working mothers.
C．University students and teachers.
D．Children and adolescents.
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单项选择题
A．Because mountainous regions have a very rich biology.B．Because they can move uphill to get cooler.C．Because there are no deserts in mountainous regions.D．Because they need a warmer environment to survive.
A．Because mountainous regions have a very rich biology.
B．Because they can move uphill to get cooler.
C．Because there are no deserts in mountainous regions.
D．Because they need a warmer environment to survive.
单项选择题
A．12 weeks.B．8 months.C．6 months.D．2 years.
A．12 weeks.
B．8 months.
C．6 months.
D．2 years.
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