问题 选择题

卢瑟福根据α粒子散射实验的结果的分析,提出了(  )

A.电子是原子的组成部分

B.原子核是由质子和中子组成的

C.原子的核式结构模型

D.原子中的电子只能在某些不连续的轨道上运动

答案

A、卢瑟福根据α粒子散射实验现象提出了原子具有核式结构,而电子则是汤姆生提出.故A错误.

B、此实验不能说明原子核内存在中子和质子.故B错误.

C、由于极少数α粒子发生了大角度偏转,原子有全部正电荷集中在原子中央很小的体积内,即原子核,这是原子的核结构模型的内容.故C正确.

D、玻尔的原子模型中提出,原子中的电子只能在某些不连续的轨道上运动.故D错误.

故选C

单项选择题
阅读理解

阅读理解。

     You know those days when it seems the world isn't on your side? When everything seems to go wrong.

However trivial (乏味的)? Well, now there's a cure-a website with the sole aim of putting a smile on your

face. The site 1000 awesomethings.com. lists those small, everyday pleasures which make life worthwhile

from finding a missing sock to pushing the button for the lift and finding that it is already waiting.

     It is the brainchild of Neil Pasricha, 30, who, beset by personal problems (his wife left him, for a start),

decided to write down one happy thought every day for 1 000 days.

     Since Neil launched the website in June 2008, it has had 17 million visitors and currently attracts more

than 50 000 people a day. Here are some of the most fanciful ideas but heart-warming thoughts...

     -Drawing on steamed-up mirrors with your fingers

     -Seeing on the television that the weather is much worse somewhere else

     -Throwing something at the rubbish bin and getting it in

     -When a book opens on the page you were looking for

     -Brushing your teeth with a new toothbrush

     -When the phone rings and it's the person you were just thinking about

     -When the thing you were already going to buy is reduced in the sale

     -Laughing at friends' passport photographs

1. What can make life worthwhile in the author's opinion?

A. Earning more money than others.

B. Establishing your own website.

C. Achieving your goal of being a celebrity.

D. A long hug when you need it.

2. Neil Pasricha launched the website because _____.

A. he decided to get rid of his personal problems

B. he wanted to find a new wife

C. he wanted to share his troubles with others

D. people are not as happy as before

3. What are the thoughts listed on the website like?

A. Common, fanciful and heart-warming.

B. Rare, small and pleasing.

C. Attractive, common and unforgettable.

D. Happy, humourous and coincidental.