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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．＄100.B．＄150900.C．＄185.D．＄200.
A．＄100.
B．＄150900.
C．＄185.
D．＄200.
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