问题 选择题

对于化学上“1+1是否等于2”的讨论,下列说法中正确的是(  )

A.10℃时,1g饱和食盐水中加入1g食盐后,所得溶液的质量等于2g

B.1g大理石和1g稀盐酸反应后溶液的质量等于2克

C.1L酒精和1L水混合后溶液的体积等于2L

D.1摩尔碳与1摩尔二氧化碳在高温条件下反应生成2摩尔一氧化碳

答案

A、饱和食盐水加入食盐不会溶解,溶液质量不会增加,故错误.

B、大理石与盐酸反应会生成二氧化碳,溶液的质量比反应前的物质的质量和要小,故错误.

C、因为分子之间的间隔存在故1L酒精和1L水混合后溶液的体积小于2L,故错误.

D、根据化学方程式:C+CO2

 点燃 
.
 
2CO可知1摩尔碳与1摩尔二氧化碳在高温条件下反应会生成2摩尔一氧化碳,故正确.

故选D

填空题
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。

     In junior high school, one of my classmates, Ethan, was addicted to TV. This boy simply knew everything

about such pop shows as Who's the Boss?

     Then one day Ethan's mother made brim an offer in order to draw him back to his school subjects. She

promised that she would give him $200 if he could go a full month without watching any TV. None of us

thought Ethan could do it, but he did quite well. His mom paid him $200. He went out and bought a TV, the

biggest he could find.

     In recent years, hundreds of schools have carried out experiments with paying kids with each for showing

up or getting good grades. All school kids admire this trend. But it upsets adults. Teachers say that we are

rewarding kids for doing what they should be doing of their own will. Psychologists warn that money can

actually make kids perform worse by making the act of learning cheap. The debate has become a typical battle

over why our kids are not learning at the rate they should he despite decades of reforms and budget increases.

[写作内容]

1. 以约30词概括上文的主要内容。

2. 以约120词对用金钱鼓励孩子学习的现象进行议论,内容包括:

   (1) 你对用金钱鼓励孩子学习的看法:

   (2) 你的父母(或其他亲人)是如何鼓励你学习的;

   (3) 你认为怎样才能更好地鼓励孩子学习

[写作要求] 

1. 作文中可以使用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. 作文中不能出现真实姓名和学校名称。

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