题目

一个圆锥的侧面展开图是圆心角为120°、半径为15cm的扇形，则圆锥的底面半径 为        cm． 答案：5How long may I ____ your dictionary? ---For one week. But it mustn’t ______ to others.A. keep, be lent B. borrow, lendC. lend, be borrowed D. have, borrow