单项选择题

A．Four.
B．Five.
C．Three.
D．Seven.
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单项选择题
A．It is not convenient to use.B．It is not expensive.C．It is very soft.D．It is very hard.
A．It is not convenient to use.
B．It is not expensive.
C．It is very soft.
D．It is very hard.
单项选择题
A．By using satellite images, maps, etc.B．By studying specific farming methods.C．By studying the variation of human population.D．By analyzing the quality of crops.
A．By using satellite images, maps, etc.
B．By studying specific farming methods.
C．By studying the variation of human population.
D．By analyzing the quality of crops.
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