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.
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A．Angry.B．Hungry.C．Tired.D．Dissatisfie
A．Angry.
B．Hungry.
C．Tired.
D．Dissatisfie
单项选择题
A．A pen.B．A school bag.C．A book.D．A pencil.
A．A pen.
B．A school bag.
C．A book.
D．A pencil.
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