The Beijing Underground’s Line Ten will soon have 40 “reverse vending machines（有偿自动回收机）”,which will pay people for their empty plastic bottles.
“We have placed two such machines at Beijing Capital International Airport and four at the city’s underground stations. They have been well received so far,” said Feng Juan, an engineer from the company which makes the machines. “People are encouraged and paid for turning waste into treasure. More than 30,000 empty bottles have been collected since December,” she said.
If something else, such as waste paper, is thrown into the machine, the machine will spit(吐) it out.
“Supported by the government, the reverse vending machines will be introduced to colleges and universities soon,” Feng said.
The company is also considering covering more recycling materials, including used books and teaching materials.
“Long-term plans call for about 2,000 reverse vending machines to be place throughout the city in the next few years, including 80 at colleges and universities, shopping malls, communities and office buildings,” Feng said.
Chang Tao, director of the company, said that if the new project works well in the city, the company will consider offering the waste-to-treasure service to other developed cities in the eastern part of China.
At present reverse vending machines are used at __________.

A．the airport and underground stations

B．colleges and universities

C．communities and office buildings

D．shopping malls and companies

Which sign probably represents the meaning of the underlined word “recycling”?

Which of the following is an opinion rather than a fact?

A．More than 30,000 empty bottles have been collected.

B．Feng Juan and Chang Tao work in the same company.

C．The machines might help people develop a recycling habit.

D．People are paid for putting empty plastic bottles into the machines.

Which of the following might be the best title for the passage?

A．Machines help turn waste into treasure

B．A new machine has become popular

C．A creative project works well in China

D．People are encouraged to collect bottles