若集合$M=\left\{x|y=\sqrt{x-1}\right\}$，集合$N=\left\{y|y=x^{-2}\right\}$，那么$M\cap N=$（    ）

Nowadays, cycling, along with jogging and swimming, _______ as one of the best all-round forms of exercise.

背景材料：老师和全班同学一致推荐小娜同学代表班级参加全校书画大赛。可小娜十分不愿意，说：“我的水平很差，肯定输得很惨，我丢不起这个人。”事后，她私下拜托书画院的叔叔替她画了一幅国画交给了学校，赢得全校一等奖。同学们祝贺她，她说：“我只代表我本人！”

运用所学知识对小娜同学的言行进行简要评析。

As a student, you should learn how to face____ (各种各样的) difficulties.