单项选择题
Such changes can alter the social structure,（）people to move.
A.which leading B.leads C.which led D.leading
单项选择题 There are many cities（）very fast.
单项选择题 Civil war or regional conflicts also cause disruption,（）people out of rural areas.
单项选择题 This growth,（）mainly in Southeast Asia and Africa, has dramatic consequences.
