He is the general manager of a big company．本题询问作者的工作。根据文章第一句话“John Wilson is the general manager of a big company．”，可得出答案为genera

John Wilson is the general manager of a big company. He is always very busy and travels a lot. He’ll be away for business all next week. He will visit several cities on his trip, have meeting with some managers from other companies, see a lot of sales people and listen to their reports. Mary is his secretary. And she won’t go with him. She’ll stay in the office answering John letters and telephones, keeping in contact with other companies and calling John to let him know about anything important. She will also be in charge of all the employees in the office. She wants to do a good job, because she wants to be promoted.