短文改错。

     英语课上，老师要求同桌同学相互修改作文。假设以下短文为你同桌所写，请你对其进行修改。

文中共有10处错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。

     增加：在缺词处加一个漏词符号（/\），并在此符号下面写出该加的词。

     删除：把多余的词用斜线（\）划掉。

     修改：在错的词下划一横线，并在该词下面写出修改后的词。

     注意：1．每处错误及其修改均仅限一词；

                2．只允许修改10处，多者（从第11处起）不计分。

     It is important to know that a parent can do to help reduce children's stress. If you notice that

your child is becoming nerve, he may have problems at the school. He may has trouble sleep. He may

be depressing and begin to suffer from headaches. You should talk him to try to discover the cause of

her stress. You can spend extra time help him. In short, you need to be complete supportive and

encouraging all the time.

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In software engineering and systems engineering, (71) is a description of a system's behavior as it responds to a request that originates from outside of that system．

A．black box

B．business rule

C．use case

D．traceability matrix