相干检测

短文改错。

     假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。

文中共有10处语言错误，每句中最多两处。错误涉及一个单词的增加、删除或修改。

增加：在此处加一个漏字符号(∧)，并在其下面写出修改的词。

删除：把多余的词用斜线(＼)划掉。

修改：在错的词下划一横线，并在其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（从十一处起）不计分。

     One day Rosa wrote to her friend, who was a doctor, invite him to have dinner with her families.

A few days later the doctor wrote back to her but she couldn't read his writing because the letters

were written careless. Then she asked her husband for the help, but he couldn't read it, too. Then her

husband got an idea. He told her that a chemist might be able read the doctor's letter. So the woman

went to chemist's. The chemist in the shop studied the letter for a long time but he gave her a large

bottle of medicine. He told the woman she should eat twelve pills a day. Finally Rosa still had no

idea whether her friend will come or not.

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下列关于栈的叙述正确的是

A．栈是非线性结构

B．栈是一种树状结构

C．栈具有先进先出的特征

D．栈具有后进先出的特征

杭州市的市树是什么？

一般自动变速器在手动转档是同时加油门，对变速有没有坏的影响？

需用3%氯化钠溶液1500毫升，现用10%氯化钠溶液及生理盐水配制，问各需多少毫升？