题目

Educating girls quite possibly provides a higher rate of return than any other investment（投资）in the developing world． Women’s education may be an unusual field for economists(经济学家) , but increasing women’s contribution to development is actually as much an economic as a social problem． And economics, with its importance on encouragement, provides directions that point to an explanation for why so many girls are prevented from receiving an education．Parents in low-income countries fail to invest in their daughters because they do not expect them to make an economic con表示你所在学校各年级的人数情况，应选择（______）式（_______）统计图比较合适。