Which of the following statements is NOT TRUE according to the passage?
Fu Xiaoyu's parents can't earn enough money to send her to school.
Huang Ruoqing and Zhang Linna talked with 29 children this summer during their research.
Some left-behind kids live with uncles, aunts, or grandparents and others live by themselves.
More than half of the left-behind kids prefer their parents' staying away working.