单项选择题

Questions 29 to 31 are based on the passage you have just heard.

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．The answer is close but not exactly correct.B．The answer is totally out of target.C．The answer is really correct.D．The answer is too obvious.
A．The answer is close but not exactly correct.
B．The answer is totally out of target.
C．The answer is really correct.
D．The answer is too obvious.
单项选择题
A．Because it is difficult to maintain a marriage.B．Because people like watching TV programs.C．Because people prefer freedom to self-discipline.D．Because our society is permissive towards divorces.
A．Because it is difficult to maintain a marriage.
B．Because people like watching TV programs.
C．Because people prefer freedom to self-discipline.
D．Because our society is permissive towards divorces.
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