当然可以省略，这是以前我给你解答过的句子。而且上次这个句子，不同的是前后都是are。

有时，为了强调主语或为了修辞“对仗”，主语也可以不省。“对仗”就是让and 前后的两个句子都有主语和谓语，使其匀称。例如：

They're usually three meters tall and they are as big as the size of a classroom.

省略they：

They're usually three meters tall and are as big as the size of a classroom.

省略they are:

They're usually three meters tall and as big as the size of a classroom.

你的这个句子：I'm a fresh, and I come from China. 当然可以省略重复的主语：

I'm a fresh, and come from China.

I'm a fresh and come from China.