问题 单项选择题

To Our Readers (读者)
Welcome to the New Century. We have changed many parts of our New Century. Photos are bigger. So you can enjoy the beautiful flowers and clothes better than before. There is more sports news. So you can know more information about sports. There is also a new column (栏目) of English learning and teaching. We are sure it will help you to learn and teach English better. We believe you will find it more intere sting when you read it.
In the six years since its founding (成立) in 1994, New Century has become the best English language newspaper (报纸) in our province. Here we want to give our thanks to Mr. Johnson for his help in the past years.

New Century is one of the best English-language newspapers in the country.
A. Right.B. Wrong. C. Doesn’t say.

As you know, we have tried our best to develop a modern English language newspaper in our province. We’ve done well. We believe we can do better in the future. We hope you will find our New Century even more interesting. Please write to us and let us know what you think of it. We welcome your suggestions.

答案

参考答案:B

问答题

案例:阅读下 * * 个教师有关“代数式概念”的教学片段。

教师甲的情境创设:

“一隧道长l米,一列火车长180米,如果该列火车穿过隧道所花的时间为t分钟,则列车的速度怎么表示”学生计算得出,教师指出:“”、“10a+2b”这类表达式称为代数式。

教师乙的教学过程:

复习上节内容后,教师在黑板上写下代数式的定义:“由运算符号、括号把数和字母连接而成的表达式称为代数式”,特别指出“单独一个数或字母也称为代数式”;然后判断哪些是代数式,哪些不是:接着通过“由文字题列代数式”及“说出代数式所表示的意义”进一步解释代数式的概念:最后让学生练习与例题类似的题目。

教师丙的教学过程:

让学生自学教材,但是教材并没有说“代数式”是怎么来的,有什么作用。接着教师大胆地提出开放式问题:“我们怎样用字母表示一个奇数”当时教室里静极了,学生们都在思考。

先有一位男生举手回答:“2a-1”。

“不对,若a=1.5呢”一位男生说。

沉默之后又有一位学生大声地说:“a应该取整数!”

有些学生不大相信:“奇数77能用这个式子表示吗”

不久,许多学生算出来:“a取39”。

此时,教师趁势作了一个简单的点拨:“只要a取整数,2a-1一定是奇数,对吗那么偶数呢”他并没有作更多的解说,点到为止,最后的课堂小结也很简单:“数和式有什么不同”“式中的字母有约束吗”“前面一节学过的式子很多都是代数式!……”从师生们自如的沟通来看,他们都已成竹在胸。

[问题]

你认可教师乙的教学过程吗说明理由

判断题