海绵式思考和淘金式思考哪一种是较为常见的思考方式？（）
A.海绵式
B.淘金式
C.都常见
参考答案：A
市场营销研究在市场经济条件下，商品与（）矛盾及其发展规律。
____the quality of schooling is high,parents are eager not only to send their children to
school,but also to____them there.
A．Where;keep
B．Where;leave
C．When;keep
D．When;leave
