A、Staying long outside. B、Working overtired. C、Working with patients. D、Wearing few clothes. B题于询问男士患上感冒的原因，文章中女士通过男士关于症状的描述，诊断其

W: Hello Jack! You don’t look well, and what seems to be the problem?
M: Actually it is big suffering for me. Every year almost this time, I must come down with something.
W: What are symptoms do you usually get?
M: You know, cough, fever, runny nose, headache and feeling chill. I’m usually miserable for a week and it just ruins my holidays.
W: Sounds like a typical flu. The heavy work must drive you exhausted this time each year. And you know, people are easily stricken by flu when they are overtired and stressed out.
M: That is quite right. (19) The period approaching New Year is the busiest time for me as an accountant. I must work overtime and keep my mind highly concentrated.
W: For this reason, you are exposed to the infection by the virus when you’re in big crowds where lots of people are coughing.
M: Yes, (20) I must spend a lot of time in department stores buying New Year’s gifts for people. Then what can I do to ward off the flu?
W: Actually it’s fairly simple. (21) Get a lot of rest, drink more water and eat well. In that way, you can regain the strength to fight against the virus.
M: All these things make sense. But one more question. Will my family members be infected by me?
W: In that case, they must get ready for the prevention, especially for the old and child. (22) They may go to the health center to have an injection of prevention medicine.