Builders have known for many years that white roofs reflect(反射) sunlight and lower the cost of air conditioning (空调设备). But now scientists say they have found a new advantage: slowing global warming.

    Hashem Akbari believes that whitening 100 of the world’s largest cities could make the influence of the expected emissions (排放物) smaller over the next ten years.

White buildings and surfaces reflect far more sunlight than dark ones. Reflected sunlight does not increase the greenhouse effect (温室效应), unlike the heat energy sent out by dark surfaces heated by the sun.

Dr Akbari, of the Lawrence Berkeley National Laboratory, California, also argues that If built-up areas were made white, less heat would stay within them, allowing people to use their air conditioners less, which use a lot of power.

Dr Akbari has found out that making 100 of the largest cities white would increase the sunlight reflected by Earth by 0.03%. He believes it would cancel out (抵消) the warming caused by 44 billion tons of carbon (碳) emissions.

“Roofs are going to have to be changed one by one and to make that effort at a very local level, we need to have an organization to make it happen,”says Dr Akbari.

He argues that while the action would not solve the problem of climate change. it would slow it.

“We can give the environment time to breathe,” he says. “I just don’t see a disadvantage of this idea. It gives everybody advantages and you don’t have to make hard efforts to make it happen. ”

Akbari and his partners say they will try to persuade the United Nations to organize big cities to change the materials of their roofs.

How do white roofs slow down global warming?

A. They reflect sunlight, which makes people use no air conditioner.

B. They reflect sunlight, which doesn’t increase the greenhouse effect.

C. They keep the heat energy within them.

D. They send out no carbon emissions.

We know from Dr Akbari that he        .

A. has changed some roofs into white ones  

B. doesn’t use air conditioners himself

C. has built an organization to make cities white 

D. believes his idea will help slow the climate change

What do Akbari and his partners want to do?

A. They hope the UN will put their idea into action.

B. They want to become members of the UN.

C They want to change the materials of their own roofs.

D. They want to teach people how to change roofs

The passags is written mainly to        .

A. persuade people to paint their roofs white

B. introduce environment friendly paint

C. show white roofs do good to the environment

D. discuss how to slow down global warming

假如你读过一本王教授写的关于温室效应的书,仍有些问题需要询问,想约他做一次电话访谈。请用英语写一封100词左右的信,信的内容如下:

本人情况介绍:柳莹,泰安二中的高三学生

约访谈的理由:现承担英语课题:温室效应

口头汇报时间:7月28日

对访谈的要求:持续时间:15分钟;教授方便时即可

对回信的要求:希望对方回信的时间为口头汇报前一周

联系方法:

你的邮件地址:Liuying@hotmail.com

参考词汇:project课题greenhouse effect 温室效应

信的开头和结尾已给出:

Dear Mr Wang,

________________________________________

________________________________________

________________________________________

Thank you for your prompt reply.

Yours truly,

Liu Ying