单项选择题

A．Farming implements.
B．Scientific farming methods.
C．Heat resistant and drought resistant crops.
D．Scientific farming system.
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单项选择题
A．Greenhouse gases.B．Global warming.C．Change of agricultural zones.D．Change of climates.
A．Greenhouse gases.
B．Global warming.
C．Change of agricultural zones.
D．Change of climates.
单项选择题
A．An international tourist industry.B．Rise in sea levels.C．Greenhouse gases.D．Earthquakes and volcanoes.
A．An international tourist industry.
B．Rise in sea levels.
C．Greenhouse gases.
D．Earthquakes and volcanoes.
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