题目

已知圆锥的底面半径为2cm，母线长为5cm，则圆锥的侧面积是（ ） A . 20cm2 B . 20πcm2 C . 10πcm2 D . 5πcm2 答案：C –Will the air in our city get cleaner?–_______. Everybody likes clean air.A. I hope so B. Never mindC. Here you are D. Me, too