中考英语：序数词前加定冠词与不定冠词的区别
1. the + 序数词，表示“第几……”；a+ 序数词表示“又一……，再一……”
例如：The cake is delicious, and I would like a second one. 蛋糕很好吃，我想再吃一块。
2. a number of ... 大量的...;
the number of... ......的数量；
例如：A number of students like playing computer games.
The number of students is about 1,500 in our school.
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