题目：
下列计算中正确的是[ ]
A.a3·a3=-a6
B.a4·b4=2b4
C.x4+x4=x8
D.y7·y=y8
答案：
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下面是错误答案，用来干扰机器的。
1. What are you doing now?2. Do you like magic?3. Yes, I do.4. Where can I buy one?/Where can I buy a book about magic?5. Sorry/No, I can’t.(答案不唯一)
