问题 不定项选择

一圆筒处于磁感应强度大小为B的匀强磁场中,磁场方向与筒的轴平行,筒的横截面如图所示。图中直径MN的两端分别开有小孔,筒绕其中心轴以角速度ω顺时针转动。在该截面内,一带电粒子从小孔M射入筒内,射入时的运动方向与MN成30°角。当筒转过90°时,该粒子恰好从小孔N飞出圆筒。不计重力。若粒子在筒内未与筒壁发生碰撞,则带电粒子的比荷为()

A.A

B.B

C.C

D.D

答案

参考答案:A

材料题
写作题

第四部分   读写任务(共两节共1小题,满分25分)

阅读下面的短文,然后按照要求写一篇150词左右的英语短文。

Jean is a bright young woman who comes from a rich and famous family. She goes to a good university and has everything that money can buy. Well, almost everything. The problem is that the people in Jean’s family are so busy that they can hardly find time to be with her. In fact, Jean is quite lonely.

So Jean spends a lot of time on her QQ. She likes being anonymous(匿名), talking to people who do not know about her famous family and her rich life. She uses the name Linda on QQ and has made a lot of friends who she keeps in touch with quite often.

Last year Jean made a very special friend on QQ. His name was David and lived in San Francisco. David was full of stories and jokes. He and Jean had a common interest in rock music and modern dance. So it always took them hours to talk happily on QQ and sometimes they even forgot their time. Of course, they wanted to know more about each other. David sent a picture of himself: He was a tall, good-looking young man with a big, happy smile. As time went by, they became good friends and often sent cards and small things to each other.

When Jean’s father told her that he was going on a business trip to San Francisco, she asked him to let her go with him so that she could give David a surprise for his birthday. She would take him the latest DVD of their favourite rock singer. But when she knocked on David’s door in San Francisco, she found that her special friend was a twelve-year-old boy named Jim!

[写作内容]

1.以约30个词概括短文大意;

2.以约为120词就“Should We Make Friends on QQ?”这个主题写一篇英语短文,并包括如下要点:

a.你对这一问题的回答或看法;

b.说明你的看法的理由;

c.简短的结论。

[写作要求]

1.作文中可使用自己的亲身经历或虚构的故事,也可以参照阅读材料的内容但不得直接引用原文中的句子;

2.文中不能出现真实姓名和学校名称。

[评分标准]

概括准确,语言规范,内容合适,篇章连贯。

Should We Make Friends on QQ ?