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在我国城乡转型进程中，农村由于人口非农业化转移带来“人走屋空”，新建住房向外围扩展，用地规模不断扩大，原宅基地废弃、闲置，形成空心化现象。读农村空心化演进的周期示意图，完成1—2题。 1．农村劳动力大量短期外出打工，宅基地出现“季节性闲置”现象主要发生在 [ ] A．出现期 B．成长期 C．兴盛期 D．衰退期 2．衰退期形成的主导因素是 [ ] A．农村产业结构优化和个人意愿 B．经济收入差异和人口增长压力 C．农村劳动力非农业化转移加快 D．村庄基础设施完善和耕地保护落实
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