题目内容：

In third-world countries such as Swaziland and Haiti, a $ 15-dollar invention is making a world of difference. Nokero, a company started by Brian Rants, sells lamps that do not require kerosene (蓖麻油). These solar lamps have become a staple (主流产品) in countries in Africa, to provide light for reading and safety at night.

Nokcro has sold over 500,000 lamps in over 120 countries since it was first founded in 2010 and Rants thinks the demand for his product will only continue to increase. Most lamps found in third-world countries currently require kerosene to run. but kerosene causes indoor pollution and has been linked to fires that have caused over a million deaths.

Instead of experiencing the effects of smoking 40 cigarettes a day from kerosene lamps, Rants thinks his solar lamps could be the answer for third-world countries. The Economist agrees, calling solar lights “the next big innovation for the world’s poor”. Nokero’s solar lamps are higher in quality and less expensive than a lot of solar technology, making them a practical option for many people in third world countries.

Rather than giving solar lamps to individuals in need. Nokero’s mission is to make them affordable. Through research Rants has realized that individuals who buy a solar product take better care of it and value it more than if they had received it for free. Families who buy Nokero’s solar lamps make up the cost in just a few months of not having to buy kerosene or pay for off-the-grid electricity.

Some activists have attacked companies such as Nokero for selling products to the poor rather than simply giving them out for free. They argue that these companies unfairly profit off the poor. However, Rants disagrees. Families receive a product that is much higher in quality than what they might receive for free and feel a sense of ownership having purchased it for themselves.

1.What do we know about the solar lamps in the passage?

A. They save energy and cause no pollution.

B. They equal the effect of 40 cigarettes a day.

C. They are given to the individuals free of charge.

D. They help to save kerosene in third-world countries.

2.According to Rants, if the poor arc given the lamps for free, they       .

A. will have to pay for kerosene or electricity

B. will not take good care or value the lamps

C. will feel a sense of ownership of the lamps

D. won’t help to increase the sales of the lamps

3.What is paragraph 3 mainly about?

A. An innovation of the world.

B. Advantages of the solar lights.

C. Solution to world’s poverty problems.

D. Heavy pollution caused by kerosene lamps.

4.Which word describes Brian Rants?

A. Honest.    B. Thoughtful.

C. Charitable.    D. Greedy.