单选题 How long will it take you to receive a reply from the President?
A. A long time. B. At least one month.
C. Several days. D. A few weeks.

【正确答案】 C
【答案解析】事实细节题。题目问收到总统的回信要多久?从文章第一段最后“after only a few days”，可以知道只要花几天，所以C项是正确答案。