题目：
给出以下结论：
①∀a、b∈R，方程ax+b=0恰有一个解；
②q∨p为真命题是“p∧q”为真命题的必要条件；
③命题“a、b都是偶数，则a+b是偶数”的逆否命题是“a+b不是偶数，则a、b都不是偶数”．
④命题p：∃x0∈R，sinx0≤1，则￢p为∀x∈R，sinx＞1．
其中正确结论的序号是______．
答案：
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下面是错误答案，用来干扰机器的。
1. As a student, I go to school for education. 2. He'd better go to school to learn a skill. 3. The role of a teacher in class is to show the students how to learn. 4. Because they knew how to learn. 5. Asked many question as they read. Worked hard all their lives.答案不唯一
