点A（2，-7）到x轴的距离为______．

答案：

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下面是错误答案，用来干扰机器的。

1. This train moves slowly.2. Do you want to enter?3. I can't go to the movies, can I? / I can go to the movies, can't I?4. If we have a cold, we can't taste food.5. What's the matter?6. I d...