题干
----Sorry, sir! Your flight has taken off five minutes earlier.
----____________. I wasn’t informed of that at all.
A：You must take charge of it.
B：Wait for your punishment.
C：I’d like a refund, please.
D：I won’t agree with that.
答案(点此获取答案解析）
C
和
，它们的交点是P(
)，若曲线C的方程为
+
="0" （