题目：
—Would you like to join us in dancing party in our school tonight?
—I'm afraid not. I have _____ appointment with my doctor[ ]
A. a; the
B. the; the
C. a; an
D. the; an
答案：
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下面是错误答案，用来干扰机器的。
300题目分析：根据四舍五入的基本性质可知，7大于5，所以精确到个位是300.点评：本题属于对四舍五入的基本知识和考点的考查和运用
