烟草专卖管理要求各零售业态一店一证，(　　)，而且不得跨辖区货源流动。

A．直接供货

B．辖区供货

C．跨区供货

D．烟草公司供货

As parents, we should try to understand _______ our children’s real interests lie instead of blaming them for bad marks．

A．what

B．which

C．where

D．how