Research on mechanism of basic endowment insurance for urban and rural residents Research on the poverty alleviation effect of critical illness insurance for urban and rural residents 并列题名：Research on the poverty alleviation effect of critical illness insurance for urban and rural residents Research on the mechanism of social cooperative governance for balancing urban and rural development 并列题名：Research on the mechanism of social cooperative governance for balancing urban and rural development Research on the demand and policy of basic old-age insurance for rural residents in China