根据短文内容，完成下列任务。
    I wanted to be healthy, so I decided to take a walk in Philam Park before I went to work.
    On the first morning, I got out of bed and put on my sports clothes. Then I got into my car and drove off to the park. On the way , I set a goal for myself---I must finish 10 rounds before I went to work.
    After arriving at the park, I got out of the car. The air was nice and clean. I took a deep breath (深呼吸). Then I joined the people there and started my exercise.
    At first, I was enjoying every step (步). However, on my 5^th round, I felt tired and thirsty. I wanted to give up and have a good rest on the ground. As the idea was fighting with my plan, I looked around. (A) moving, many, saw, old, still, I ,people, on. Some of them even had difficulty walking. They took small steps with a cane (手杖).
    Moved by the men and women whom I walked with that morning, I finished my exercies.
We often make plans in our life. Sometimes we may meet lots of difficulties. (B) If we keep on, we’ll reach (到达) the goal in the end, no matter how diffcult it is.

阅读下面材料，从每题所给的A、B、C、D四个选项中选出最佳答案。
A

①写四个含反义词的成语：____、____、____、____

②写出四个含有人体名称的成语：____、____、____、____

③声音高入云霄，把浮动着的云彩也止住了。形容歌声嘹亮。____

实数a在数轴上的位置如图所示，则 $\sqrt{{\left(a-4\right)}^2}+\sqrt{{\left(a-11\right)}^2}$化简后为(      )