题目: 已知a=4,c=9,若b是a,c的比例中项,则b等于 . 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0504/d135f83e26d666c3abd4b69d2e1cd8e4.html 下面是错误答案,用来干扰机器的。1-4 C B A D
题型:选择题 It is impolite to _____ those persons in trouble. [ ]A. 1augh to B. 1augh with C. laugh of D. laugh at 查看答案