问题 选择题

下列物体中一定带负电的是(    )

A.与玻璃棒摩擦过的丝绸

B.与带正电的物体接触后的验电器

C.失去电子的塑料棒

D.与带正电的物体相吸的小物体

答案

答案:A

题目分析:A、玻璃棒和丝绸摩擦,玻璃夺电子的本领弱,摩擦过程中,失去电子因缺少电子带正电;丝绸夺电子的本领强,摩擦过程中,因多余电子带等量的负电.符合题意.

B、原来金属球不带电,对外显中性,金属球与带正电的玻璃棒接触时,带正电物体夺得电子的本领大于不带电的金属球,带正电的玻璃棒夺得电子,验电器失去电子带正电.不符合题意.

C、由于塑料棒失去电子因缺少电子带正电.不符合题意.

D、带正电的物体靠近带负电的轻小物体时,可以相互吸引,带正电的物体靠近不带电的轻小物体时,也能出现吸引现象;所以该轻小物体可能带负电,也可能不带电.不符合题意

单项选择题
写作题

读写任务。

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。

     The ultimate (最终的) goal of life is to achieve happiness, and the way to achieve happiness is to

wise management. So says The Sims (模拟人生),an American strategic life-simulation computer game

that lets you create, direct, and manage the lives of SimCity's residents.

     Similar to the life of a real person, the game begins with the creation of your simulated(模拟的)people: pick a name and a gender, decide on personality/astrological sign (星座), and then choose a look from a

variety of heads, bodies, and skin tones. Each little Sim person has all basic needs (Hunger, Comfort, Fun, etc.) like a human which can be satisfied by interaction with other Sims or purchased objects. Name,

gender, and appearance don't affect gameplay much, but personality determines how your Sim plays with others.

     One gameplay goal is to improve your Sim and eventually help him or her achieve happiness. With

proper management he or she can climb a career ladder, which nets him or her more money. This allows

the purchase of higher quality stuff, which lets you improve your Sim even more. With suitable care, your

Sim can have a mate, kids, and a mansion with an indoor pool. Mismanage your new, simulated family,

and fights will break out, jobs will be lost, and the house will fall apart.

     With The Sims, you can create whatever and whomever you desire. Triumph or tragedy? You name it. In your real life, it is the same case.

[写作内容]

1. 约30个词概括短文的要点;

2. 然后以约120个词写一篇文章,并包括以下要点:

1)模拟人生就是规划人生,说出人生规划的重要性。

2)就如何有效规划高三学习,谈谈你的具体做法。

[写作要求]  

1.可以参照阅读材料的篇章结构组织故事,但不得直接引用原文中的句子;

2.标题自定。

[评分标准] 概括准确,语言规范,内容合适,篇章连贯。

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