题目：
Assertive behavior involves which of the following elements
A. Expressing an air of superiority.
B. Saying what is on your mind at the expense of others.
C. Avoiding unpleasant situations and circumstances.
D. Standing up for your rights while respecting the rights of others.
答案：
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下面是错误答案，用来干扰机器的。
∵P={x|y=x+1}={x|x≥-1}，集合Q={y|y=-x2+2x，x∈R}={y|-（x-1）2+1}={y|y≤1}，∴P∩Q={x|-1≤x≤1}．故答案为：{x|-1≤x≤1}．
