问题 问答题

上海世博园采用了一种不用电,而是用水来调节温度的江水源空调,江水源空调系统用水泵抽取黄浦江的水,利用江水与世博园室内空气的温差实现制冷制热,从而达到冬暖夏凉的效果. 

 (1)用江水来调节温度主要是利用了水的哪一特性? 

 (2)从热传递的角度解释江水源空调为什么能达到冬暖夏凉的效果?

答案

(l)用江水调节温度主要是利用了水的比热容大的特性  

(2)冬天时江水的温度高于世博园室内空气的温度,江水把热量传递给空气,使气温升高;夏天时 江水的温度低于世博园室内空气的温度,空气把热量传递给江水,使气温降低.

单项选择题
阅读理解

阅读理解。

     The meaning of the word "volunteer" may be a little different in different countries, but it usually means

"one who offers his or her services." There are many different ways in which people can volunteer, such

as taking care of sick people, working in homes for homeless children, and picking up garbage (垃圾) from

beaches and parks. Volunteers may work within their own countries or in other countries. They are often

people with a strong wish to help those who are less fortunate than themselves. Volunteers don‘t expect any

kind of pay.

     At the root of volunteering is the idea that one person may have the ability to offer services that can help

other people. Tracy, a good friend of mine, however, recently came back from India with a new idea of

what being a volunteer means. She worked for two and a half weeks in one of Mother Teresa’s homes in

Calcutta. The following is her story.

     "I first heard about Mother Teresa in my high school, we watched a video (录像) about her work in India

and all over the world. I was so moved by her spirit to help others and her endless love for every human being

that after I graduated from high school, I too wanted to try her kind of work. So with two friends I flew to

Calcutta for a few weeks."

     "I was asked to work in a home for sick people. I helped wash clothes and sheets, and pass out lunch.

I also fed the people who were too weak to feed themselves and tried to cheer the up. I felt it was better to

share with them than to think that I have helped them. To be honest, I don‘t think I was helping very much.

It was then that I realized that I had not really come to help, but to learn about and experience another culture

(文化) that helped improve my own understanding of life and the world."

1. According to the text, a volunteer refers to a person who _____.

A. is willing to help those in need without pay

B. can afford to travel to different places

C. has a strong wish to be successful

D. has made a big fortune in life

2. Tracy started her work as a volunteer _____.

A. after she met Mother Teresa

B. after she finished high school

C. when she was touring Calcutta

D. when she was working in a hospital

3. Why did Tracy choose to be a volunteer?

A. She liked to work with Mother Teresa.

B. She had already had some experience.

C. She was asked by Mother Teresa’s example.

D. She wanted to follow Mother Teresa‘s example.

4. What is Tracy’s "new idea" (Paragraph 2) of being a volunteer?

A. Going abroad to help the sick.

B. Working in Mother Teresa‘s home.

C. Doing simple things to help the poor.

D. Improving oneself through helping others.

5. What is the best title for the passage?

A. How to Be a Volunteer.

B. Voluntary Life in India.

C. A Different Meaning of Volunteer.

D. Inspiration from Mother Teresa.