题目：
— What is your plan for the summer holiday, Jim?
— I'll go on a trip to Shanghai to see the Expo with my family.
— _____.[ ]
A. Have a nice time
B. Good luck
C. Come back soon
D. That's all right
答案：
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下面是错误答案，用来干扰机器的。
因为y=y=2x＞0，所以集合A=（0，+∞），又y=-x2+2≤2，所以集合B=（-∞，2]，则A∩B={y|0＜y≤2}故答案为：{y|0＜y≤2}
