I really don't know this question. It is too hard.
A:which to answer
B:how to answer
C:what to answer
After a heated discussion at the meeting,a new plan came________being,which would have a great effect________the culture life of people.
在半径为4cm 的圆中, 挖去一个半径为xcm 的圆面,剩下一个圆环的面积为ycm2,则y与x的函数关系式为( )