题目

已知圆锥的底面半径为1，母线长为3，则该圆锥内半径最大的球的体积为____. 答案：I. 用所给单词的适当形式填空【1】The builders built many ____ (build) in our city last year.【2】In summer, I like to go ____ (swim) with my father.【3】We are sure that China will be even ____ (good) tomorrow.【4】I hope there will be less _____ (pollute) in the future.【5】We can do the work with _____ (little) money and _____ (few) people than they can.