问题 实验题

小琳同学在探究,将玻璃板竖直立在水平桌面上,再取两段相同的蜡烛A和B一前一后竖直放置在桌面上,点燃蜡烛A,移动蜡烛B,直到看上去它跟蜡烛A的像完全重合,如图12所示。在此实验中:    

(1)有规格相同的茶色玻璃和普通玻璃,小琳应该选择__________玻璃。    

(2)小琳用两段相同的蜡烛是为了比较像与物的     ________关系。    

(3)移去蜡烛B,在其原来的位置上放一光屏,光屏上不能承接到蜡烛A的像,这说明平面镜所成的像是          (选填“虚”或“实”)像。

(4)本实验中,用一根未点燃的蜡烛来代替已点燃的蜡烛在镜中的像,以确定像的位置。在下列实验操作中,也用到这种方法的是          

A.研究电阻跟导体材料的关系时,控制导体的长度和横截面积相同    

B.在电学实验中,用两个10Ω的电阻串联代替一个20Ω的电阻

C.在研究电流的热效应中,根据煤油温度的变化,判断电流产生热量的多少

答案

(1)茶色    

(2)大小  

(3)虚  

(4)B

单项选择题
写作题

阅读下面文章,然后按照要求写一篇150词左右的英语短文

With the development of information industry, our personal information has become more easily exposed in public.As some celebrities are worried about their telephone number, ID number and home address being put on the Internet, ordinary people like us can't escape from the doom either.

A recent report from Xinhua reveals over twenty telephone-salespeople have been caught cheating customers by revealing their private information to local community of Beijing.

The report says the salespeople would call their potential customers trying to earn their trust by correctly revealing their personal information such as their name, telephone number, home address and even previous purchases.

They would then try to persuade the customer to buy a gold cellphone by mail.If the customer became suspicious, they would use another person's identity to prove their authenticity.

写作内容:

你在某英文报刊看到这则报导后,准备就我们学生该“ How can we keep our personal information off the Internet?”写一篇文章给该报编辑部,题目是“How can we keep our personal information off the Internet?”。

内容要点包括: 

1.以约30词简要概括新闻内容;                 

2.然后以约120词谈谈你的观点,内容包括:

(1)在信息时代,想让个人信息完全与世隔绝是不可能的,但可尽量减少;

(2)你为解决信息泄露所采取的一些措施:

A.到有安全保障的网站买东西;

B.只向能确保你个人信息安全的网站提供个人信息;

C.其它一些你认为有效的措施.

写作要求: 

1.可以使用实例或其他论述方法支持你的论点,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.作文中不能出现真实姓名和学校名称;

3.文章开头己给出,不计入单词总数。

评分标准:概括准确,语言规范,内容合适,篇章连贯。