语法填空
A positive attitude is very important as it will make our life easier. In life, not everything goes as ____(smooth) as we want. There will be times when we will face problems and difficulties. The most ____(challenge) part is ____we react when we experience problems and difficulties.
Instead of being discouraged, those who have a positive attitude ____ (treat) each failure as a lesson. And they will be inspired to achieve the goal.____those who do not have the positive attitude will see problems and difficulties ____ a different way. With different attitudes, the result will be quite different. Since every one of us ____ (possess) the same amount of time, why don't we just make the best ____the same amount of time with a positive attitude? Life itself is already hard. It will be much ____(good) if we have a positive attitude which will make our life happier and easier.
If you learn to see the bright side of life when you ____(surround) by difficulties, you'll be building your positive attitude fast.
是偶函数，
在［0，2］上是单调减函数，则（ ）
