题目内容

软件危机出现于60年代末，为了解决软件危机，入们提出了【】的原理来设计软件，这就是软件工程诞生的基础。

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Part A
Suppose you have done something wrong to your friend Liu Ming for misunderstanding. Now write a letter to apologize to her. You should write approximately 100 words. Do not sign your own name at the end of your .letter. Use" Han Mei " instead. You do not need to write the address.

Then his attention being attracted by a stone of peculiar shape，which he could see clearly