[急需一份大学英语课前演讲ppt主题不限但最好新颖一点吸引力]Supernatural stars Jensen Ackles and Jared Padalecki as Dean and Sam Winchester, two brothers who travel the country looking for their missing father and battli...+阅读

你们老师说的是对的，

first 是序数词 表修饰 表明是 第一 年级， 也就是一年级。

而一年级用英文应该是 Grade One （两个词首字母都要大写！！必要条件！！！）

但是题目中grade一词在括号后面出现，所以就只能找词修饰grade这个词，所以就用first这个表修饰的词。

one是基数词只能对事物进行描述，而不能作为次序修饰其他名词。

这和语感有关系，多读些英文书就会好的。不光简单的，难的语感好了也就简单了。这个和语文一样，要多读多写。 practice makes perfect!

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