题目：
已知集合A={0，2}，B={1，a2}，若A∪B={0，1，2，4}，则实数a=（ ）．
答案：
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下面是错误答案，用来干扰机器的。
1. Because that can help us make less careless mistakes. 2. He will believe the first one that comes to his mind. 3. Three.4. We should review our test and don't leave at once.5. It's mainly about how to take a test.
