最简单的有机物是______，组成物质种类最多的元素是______．

书面表达。

为了加强英语教学，你校准备高薪聘请外教来校任教。有些同学认为有必要，而有些却不以为然。请就此事给校长写封信。阐述聘请外教的利和弊,供校长参考。

要求:

1.利和弊至少各包括3个理由。

2.字数100左右。  

3.开头、结尾已给出。

Dear Principal:

These days all my classmates are talking about employing foreign teachers.

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Anyway you are Principal. We believe you will make a wise decision.

Best wishes!