中国大学MOOC: He is five and she is seven.

中国大学MOOC: He is five and she is seven.

中国大学MOOC: He is five and she is seven.

选题阶段是社会调查的( ),也为整个社会调查指明了基本的方向。

答:起点

中国大学MOOC: He is five and she is seven.

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