A、Three years. B、Four years. C、Five years. D、Six years. C对话中女士说男士5年前刚到公司是一名邮政职员，男士说他自己现在是5级高级职员，故答案为[C]。

M: Good morning, Mrs. Green. You want to see me?
W: Yes, Jim. Let’s review what you’ve done so far. You were hired as a mail clerk about five years ago. You’ve learned a lot since then, haven’t you?
M: Sure. I learned more about the company because I went around to different offices. Then I was promoted to mail distribution clerk. That’s two grades higher than the mail clerk. So I skipped a grade. I went from Grade 1 to Grade 3.
W: Did you like that job?
M: Yeah, my pay went up, and every year I moved up a step. Every time I moved up a step, I got a pay raise. It was a Grade 3, Step F. But I didn’t go outside. I was usually in the mail room. I was in charge of the other messenger clerks.
W: You were a boss.
M: Right. After three years, the manager said he wanted to help me move up. They gave me a little test — arithmetic, alphabetizing, and some typing.
W: You did well on the test.
M: Yes. I did well because I studied at an adult school, and I practiced at home before the test. So I got this job as senior clerk. I’m a Grade 5 now.
W: Well, Jim, here is another chance to move up the ladder. The Mail Department is getting some new computers. We will give everybody two days of training. The people who learn quickly can go to school for more training.
M: You mean going to school on company time? Go to school instead of coming to work?
W: Yes, because it will help you in your work later. You can be promoted to production programming after you’ve learned to use computer. The job starts at Grade 7.M: Well, I’d like to think about it for a few days. Maybe I should stay where I am now.
Questions 19 to 22 are based on the conversation you have just heard.
19. What is mainly discussed in the conversation?
20. How many years did it take the man to move up to Grade 5?
21. Who can get the chance to go to school for more training?
22. What can be inferred from the conversation?