题目内容：
Directions:You should write your responses to both Part A and Part B of this section on ANSWER SHEET 2．
You have an appointment with Mr． John Smith, your client, in his office the day after tomorrow． But you won't be able to meet him, as your boss has just told you to deal with some urgent business in another city．
Write an email to Mr． John Smith,
1) to apologize for postponing the appointment;
2) to expl~in why the appointment has to be postponed;
3) to make a new appointment．
You should write approximately 100 words． Do not use your own name at the end of your email message． Use "Wang Lin" instead．
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