单项选择题

A．By using satellite images, maps, etc.
B．By studying specific fanning 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．It’s time to urge him to study math.B．He himself should make the decision.C．They should help him study math.D．They should leave him fight now.
A．It’s time to urge him to study math.
B．He himself should make the decision.
C．They should help him study math.
D．They should leave him fight now.
单项选择题
A．In EuropeB．Outside EuropeC．In the USAD．Outside the UK
A．In Europe
B．Outside Europe
C．In the USA
D．Outside the UK
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