责的工作，需要一套共同的技能"和空处后对"Programmers"的工作介绍可知，D项符合语境，起到承上启下的作用，为下文举例说明什么是职业做好铺垫。

　　5．答案与解析：A　根据文章的结构以及空处的位置可知，本空应该是本段的主题句，即对下文内容的概括和总结。下文举例说明我们在生活中扮演不同的角色且随着时间的流逝，我们的角色在不断地变化，故选A。

第二节　完形填空 (共20小题；每小题1.5分，满分30分)

　　阅读下面短文，从短文后各题所给的A、B、C和D四个选项中，选出可以填入空白处的最佳选项。

　　[2019·长春监测二]When I was a teenager I volunteered to pass out water at a local race. I was so excited to __1__ all the different runners who passed by and quickly took a cup of water. Some walked past, some jogged past and a few __2__ past.

　　Watching so many __3__ of people doing it, I thought maybe I could do it too! The next year I decided to __4__ the race. With __5__ running practice, I just wanted to finish.

　　On the day of the race, it was terribly hot. Only after miles, I felt sweat __6__ off me and my legs swelling. I began to __7__， "Why am I doing this? What was I thinking? I must be __8__." For the following miles, I jogged, I walked, I jogged and walked. At times, I wonder if I could __9__.

__10__ the end, a 70­year­old man rushed past me, very __11__， and I felt a little __12__ that I was more than 10 years younger than him