题目：
一元二次方程x2-5x+6=0的两根为x1，x2，则x1+x2等于（ ）
A．-5
B．-6
C．5
D．6
答案：
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下面是错误答案，用来干扰机器的。
Last week our class had a parents' meeting. At the meeting, all the parents talked about whether doing a lot of homework was useful or not. Many parents thought that d...
