Lesson 2 Artificial Intelligence
学案
一. 知识点精讲
（一） 生词
1. category 类别，种类，范畴
fall into a category 属于某类
Helen groups all people into two categories: those she likes and those she dislikes.
海伦把人分为两类：她喜欢的和她不喜欢的。
Voters fall into three main categories.
选民可分为三大类。
2. exit
(1). a door or space through which you can leave a place, especially a room in a big building.出口
eg: We made for the nearest exit.
我们走向最近的路口。
