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备注：请直接顺次写出1）与2）的构型，两个字母之间不能插入任何字符，否则系统会判错误。

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5. These days, it seems that an increasing number of people are leaving rural areas to live in the city. Discuss some of the effects of rural depopulation (migration from the country to the city) and suggest some ways in which this trend could be reversed.
A．Definition
B．Examples
C．Classification
D．Cause and effect
E．Process
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