23．A　根据最后一个夏令营的介绍中的Camps cost$ 20 per child/day if you register & pay by June 8 and $ 25 per child/day after一句，可知在6月8日前报名并交费参加这个夏令营，可享受打折优惠，而其他三个夏令营没有这种优惠。

　　范文：

　　Dear Mr. Wang，

　　We haven't seen each other for ages. How is everything going on with you?

　　I am

　　writing to tell you the good news that I have already been admitted into Beijing University in advance. Actually speaking, you are the very person I should first say thanks to. It is you who helped develop my interest in English. Without your help, I would not be good at English.

　　Beijing University is a place which I have been longing for. I am sure I will learn

　　a lot there. Besides my major, I will take part in all kinds of activities, which will surely do good to my future career.

　　I know you are always busy with your teaching work. Do take care of yourself. It is known to us all that health is the most important. Next time I come back I will visit you.

　　Best wishes!

　　Yours，

　　Li Hua

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