单项选择题

A．Greenhouse gases.
B．Global warming.
C．Change of agricultural zones.
D．Change of climates.
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单项选择题
A．It’s a common disease.B．It’s both mystifying and frightening.C．It’s easy to cure.D．Only animals catch AIDS.
A．It’s a common disease.
B．It’s both mystifying and frightening.
C．It’s easy to cure.
D．Only animals catch AIDS.
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