“止于至善”要求我们养成＿＿＿＿的习惯（    ）

“母鸡中的战斗机”﹣﹣据报道：英国某农场，一只母鸡曾孵出了5只小鸭．这些小鸭一出生就紧紧跟随着母鸡，面对哪些与自己长相不同的鸭宝宝，这只鸡妈妈毫不在意，还经常带着它们外出“散步”．

根据短文内容, 选择正确答案。

    Hi. I'm Liu Ying. This is my school. It's big and beautiful. There are twenty classes in my school. There are nine hundred(百) students in my school. There are four beautiful gardens in it. There is a building in my school. On the first（第一） floor, there are two offices and a hall. There are six classrooms on the first floor too. On the second floor, there are fourteen classrooms and two toilets. There is a big library and some reading rooms in my school too. I like my school very much.

一位运动员正在跑上斜坡，如图所示，运动员受到的力有(空气阻力忽略不计)（   ）