从方框中选择正确选项。完成短文．并将其字母序号写在短文后面的空格内。(方框中有两个选项是多余的)

   Sometimes, life isn't as perfect as we imagine. If so, what will you do?
   Liu Wei, the famous pianist____arms in China, is a good example. He lost his arms in a____ accident when he was only 10 years old. However, he wanted to keep his dream. He learned to swim in a recovery( 康复) hospital when he was 12. Two years____, he won two gold medals in a National Swimming Championship for the disabled. After that, he began to learn how to type with his feet. He____  the world record and became the person who could type ____ with his feet. In the following years, he started learning to play the piano.
Last year, he became the ____ of China' s Got Talent Show( 中国达人秀). He always says, " There are two ways in my life. I will____ live a wonderful life or die. " We can learn____  from Liu Wei. No matter how hard the life is, keep smiling to ourselves.
   Martin Luther King has ever said, " We must accept( 接受) disappointment in our life, but we must never lose our ____ " What he said is quite true. When we____ difficulties. Please face them bravely. Where there is a will, there is a way.

嘉峪关市的人口总数约为23.185万人，面积约为0.29万平方千米，则嘉峪关市的人口密度约为（　　）

已知回归直线的斜率的估计值为1.23，样本点的中心为（4，5），则回归直线方程为（　　）