What does it mean by "he had to eat his words"(Para. 1)? Recognising broad categories of images is one of the general problems

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问题 What does it mean by "he had to eat his words"(Para. 1)?
Recognising broad categories of images is one of the general problems that computers are not______.

选项

答案good at

解析 由题干中的recognising broad categories of images定位到文章第3段第2句Among the tasks that computers are bad at is recognising broad categories of images.根据第2段第2句和所定位的句子可知计算机并不擅长解决一般性问题,文中用的是:be bad at的结构,题目中多了一个not,因此应填其反义词good,构成be not good at的结构。
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