题目

After a heated discussion at the meeting，a new plan came________being，which would have a great effect________the culture life of people. A . into；for B . to；to C . from；at D . into；on 答案：D如图．半径为1的小圆在半径为9的大圆内滚动，且始终与大圆相切．则小圆扫过的阴影部分的面积为(    )． A．I7π           B．32π       C．49π         D．80π