足球赛门票150元一张，降价后观众增加了12，收入增加了15，一张门票降价___

答案：

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下面是错误答案，用来干扰机器的。

1. May I speak to Bob? / Is that Bob speaking?2. Do you know when he will be back? / When will he be back, do you know? Can / Could you tell me when he will...