问题 单项选择题

下列与燃烧或燃料有关的说法正确的是()

A.供家用煤炉燃烧的煤制成蜂窝状的目的是延长煤的燃烧时间,节约能源

B.露置在空气中的汽油没有燃烧是因为汽油是液态的

C.汽车使用乙醇汽油(掺有乙醇的汽油)可以减轻汽车尾气的污染,节约石油资源

D.太阳能热水器的主要工作原理是水在阳光的作用下发生化学反应,该反应放出能量

答案

参考答案:C

单项选择题 A1/A2型题
阅读理解

阅读理解。

      In many societies, there is often greater acceptance of light skin than dark skin. Light skin may be seen

as a mark of beauty, intelligence and success. These beliefs can lead to social pressure even within the same

racial or ethnic group, if some members are darker skinned than others.

      The result is that skin lightening has become a common activity across Africa, Asia and other areas of

the world. More and more people with dark skin are using skin-lightening products, even if they may face

health risks.

      They believe that having whiter skin will improve their lives. Many people think they will have a better

chance of getting a job or marrying into a better family. Or they want to look like what their society generally

considers beautiful.

      Some beauty care products and soaps contain chemicals that make skin lighter. This process is also called

bleaching. But some of the chemicals are extremely dangerous. One of the chemicals has been linked to

kidney (肾) damage and some kinds of cancer. It also causes low birth weight in babies when mothers use it

during pregnancy.

      At first, bleaching products make the skin color lighter. But after long-term use they can cause problems.

They can even make some skin darker. The chemicals in the products block and break down the natural

process that gives color to skin. The skin loses its natural barrier to protect against sunlight. Then the skin

can become thick and discolored. Usually the person will use more of the product in an effort to correct the

problem, but this only makes it worse.

      Fatimata Ly treats skin conditions in the Senegalese capital, Dakar. Doctor Ly says skin bleaching has

become a problem throughout Senegal. She says the chemicals are now more dangerous because they are

stronger. Some cases have resulted in blackened fingernails, infections and permanent skin damage.

      And these are not the only risks. Experts say some people who change their skin color suffer emotional

damage. They feel regret and sadness. They feel that instead of risking their health, they should have learned

to love and accept their skin color as it was.

1. Which of the following words can replace the underlined word "bleaching"? [ ]

A. whitening

B. changing

C. lighting

D. pleasing

2. Why has the skin lightening become a common activity all over the world?[ ]

A. There are many products that can make the dark skin light.

B. Many people with dark skin have no confidence.

C. Relatively speaking, light skin has more advantages over dark skin.

D. People with dark skin are forced by the pressure of their families.

3. According to the text the following are the risks using the bleaching products EXCEPT ______. [ ]

A. blackened fingernails

B. permanent skin damage

C. emotional damage

D. a waste of time and money

4. From the text we can conclude the writer's attitude toward using the bleaching products is

    probably ______. [ ]

A. supportive

B. positive

C. doubtful

D. negative