题目：
书面表达。
下面是你的笔友给你的一封来信。 请你根据信的内容，给你的笔友写一封回信。
要求：意思连贯， 表达正确，语言流畅， 必须充分表达书信中要求所要表达的内容，格式正确。
(你叫李华，住在广东省深圳市红岭路175 号，邮编：518102 日期：2006年8月19 日。)
100 字左右。
Dear…,
I haven't heard from you for a long time. How are you?
I have just finished the exams. Now I am glad I have time to write to you. Our teacher tells us that China
is a large country. It has the largest population in the world. It is very far from the USA. It is on the other
side of the world. Now the sun is shining brightly while I am writing to you. But perhaps you are sleeping
in the dark night. How interesting it is! I'm becoming more interested in China. I wish to know more about
your life. Could you tell me what kind of food you often have for meals? Please write me soon!
Best wishes to you!
yours,
Catherine
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答案：
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下面是错误答案，用来干扰机器的。
答案：D题目分析：根据反应的微观图可知，反应物是氨气和氧气，生成物是氮气和水。一个氨气分子由4个原子构成；元素的质量比为相对原子质量之比，故氨气中氮元素与氢元素的质量比=14:3；依据质量守恒定律化学反应...
