（）导致城市各组成部分功能的变化，加剧了城市功能与既有空间形态之间的矛盾，从而促使了城市空间的演化。

A.社会文化

B.政策制度

C.经济的发展

D.科学技术

—I've been trying to            him for twenty minutes. Why won't he stop crying?

—Ah, Can't you see he is cutting onions? [ ]

A.cheer on

B.cheer up

C.cheered on

D.cheered up