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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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单项选择题
A．She’’ll take care of her sister.B．She’’d go jogging with the man.C．She’’s going to look after her sister’’s child.D．She’’s engaged to someone else.
A．She’’ll take care of her sister.
B．She’’d go jogging with the man.
C．She’’s going to look after her sister’’s child.
D．She’’s engaged to someone else.
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