题目

 Nowadays many young people like ______ sports, such as skydiving and bungee jumping.    A. funny                        B. loose                        C. extreme           D. official 答案：C若|a|=3，|b|=5且a＜0，b＞0，则a3+2b=（　　） A、17B、-17C、17或-17D、以上都不对