物体中的分子、原子、电子等微粒的运动状态如发生变化，就会激发出一种（）。

A、电磁波

B、自由电子

C、射线

D、放热

假如你是李华。下面是你的外国笔友Mary给你的一封电子邮件，请你根据这封邮件的内容，给她写一封回信。

Dear Li Hua ,

Time flies. The new semester is beginning. How is everything going?

You told me that there might be new teachers for your class this semester. How are they? Do you like them?

Please write back to me.

Yours,

Mary

写作要求：1. 内容完整充实，情感真挚；

2. 语言连贯通顺，无语法错误；

3. 词数：80-100（开头结尾已给出，不计入总词数）。

Dear Mary，

I was glad to receive your letter. I would like to tell you about my new teacher/ teachers.

___________________________________________________________________________

How are your new school and your teachers? Do you like them? I'm looking forward to your reply.

Yours,