请你帮助苗苗分析回答：

实数a、b在数轴上的对应点的位置如图所示，化简$\sqrt{{\left(b-1\right)}^2}-\sqrt{{\left(a+1\right)}^2}$的结果等于(      )

                                                                                Life is difficult.
   But life is no longer difficult when we truly understand and accept it. Most people do not fully see this truth. Instead, they complain about their problems and difficulties. They think life should be easy.
   What makes life difficult is the process of facing and solving problems. Problems make us sad or lonely or angry. These are uncomfortable feeling. 1) Since life has lots of problems, it is always difficult and full of pain and joy as well. However, when we successfully solve them, we can feel that life is very interesting and pleasant.2) __________ are serious tests that can tell _______ from failure. In school we set problems for the students and encourage them to learn well. 3) We learn through the pain of meeting and working out problems. For this reason, wise people learn to face bravely but to deal with the difficulties in their life.
____ 将（1）句译成英文
____ 在（2）句的空白处填入适当的词使句意完整、上下文通顺
____ 将（3）句译成中文
____ We get knowledge in the process of solving the problems.
____  从文中找出最能表达该短文主题的句子