A．作用于金属棒上的各个力的合力所做的功等于零

B．作用于金属棒上的各个力的合力所做的功等于mgh与电阻R上产生的焦耳热之和

C．恒力F与安培力的合力所做的功等于零

D．恒力F与重力的合力所做的功等于电阻R上产生的焦耳热

（1）将磁铁N极向下从线圈上方竖直插入L时，发现指针向左偏转。俯视线圈，其绕向为＿＿＿＿＿（选填“顺时针”或“逆时针”）。

（2）当条形磁铁从图中的虚线位置向右远离L时，指针向右偏转。俯视线圈，其绕向为＿＿＿＿＿＿（选填“顺时针”或“逆时针”）。

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（∧），并在其下面写出该加的词。

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。

Dear guests,

On behalf of our school, I would like to express our warm welcome to you. We are luck to have you here in middle of our English Week Activities. As planning, we have English Talent Show today. The purpose of this program was to develop our interest in English learning and practically abilities in listening and speaking. The program consists in the following activity: recitation, singing, word spelling, storytelling and so on. The show will begin at two o’clock this afternoon at the Student Centre. Dear guests, we are welcome to take part in some activities. I hope we students will be benefit from your presence but I sincerely wish you a pleasant time with us.

Thank you.

假定你是李华，你的网友Charlie正在美国的一家孔子学院学习中国文化，他读到＂孟母三迁＂的图片文字，不太理解＂昔孟母，择邻处＂故事的内容，请你给他写一封电子邮件。要点如下：

1. 简要介绍＂孟母三迁＂的故事；

2. 说明故事的教育意义：

3. 欢迎他来中国学习。

注意：

1. 词数100左右。

2. 可以适当增加细节，以使行文连贯；

3. 开头语已为你写好。

参考词汇：孟母三迁：Mencius’ Mother Moving Three Times

Dear Charlie,

I’m glad to hear that you are learning Chinese culture in Confucius Institute.

________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

Yours,

Li Hua

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（∧），并在其下面写出该加的词。

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。

Dear Mr. Green,

I’m very exciting to learn that you will start a magazine together. That sounds great and I definitely agree you on that.

Some of the columns that you mention in the letter are really my cup of tea. ＂Cultural Express＂ give us a better understanding of the world. Since people from different part of the world have different values, it’s necessary to learn from each another. Apart from that, ＂ Blurt Out＂ is pretty good for Chinese students to learn English idioms and improving oral English. ＂ Entertainment＂ is also cool! The popular singers, actors or celebrities are so attractively that you absolutely can’t miss this part. Teenagers are to fond of popular things, too.

Well, I can’t list more. I really can’t wait to read this magazine.

Yours,

Li Ming

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（∧），并在其下面写出该加的词。

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 was the International Women’s Day. Li Hua had a good idea and tells his father that he was going to do everything to celebrate it. He asked his father to help him. First they decided to do some housework, that was always done by his mother. Li Hua cleaned the house completely while his father did some shop. Then they made a good meal, cooking fish, pork, chicken, soup but some other delicious dishes. Li Hua laid the table and set a vase full with flowers in the middle of the table. After that they hid them behind the door and waited the mother in order to give her a surprise. When his mother came back and saw the delicious food, she felt happily.

（1）_________________________________________________；

（2）_________________________________________________；

（3）_________________________________________________。

A．质谱仪是分析同位素的重要工具

B．速度选择器中的磁场方向垂直纸面向外

C．能通过狭缝P的带电粒子的速率等于

D．粒子打在胶片上的位置越靠近狭缝P，粒子的比荷越小

（1）磁场的指向应该向里还是向外？

（2）速度为多大的电子才能通过小孔S?