【正确答案】 C

【答案解析】PROFESSOR:Mary, why do you want to change your major? Have you found any difficulties in studying Economic History? MARY:Yes, a lot. What's worse, I find there are not enough tutorials. When I have some questions, there is nobody that I can consult with. PROFESSOR:On this condition, you may make an appointment with the teacher, as he or she is so busy. You can also contact the teacher by Email, or visit the teacher in private when he or she is free. MARY:I have got in touch with my teacher by email, and it does have some positive effects. But I think it is better to discuss with the teacher face to face. PROFESSOR:That's right. Discussing with classmates is also a good method, since the teacher's tutorial is not available sometimes. MARY:I will have a try. Thanks for your suggestion.

【正确答案】 A