China is pretty much obsessed with QR Codes(二维码), which were responsible for $8 trillion worth 【小题1】 business deals last year. Businesses should look to China when it comes to 【小题2】(understand) just how far QR Code usage can really go.

China had long realized the 【小题3】(convenient) of using QR Codes as a method of payment. WeChat is without doubt the top App in China, especially considering that 93% of 【小题4】 population there use it. This App includes a function 【小题5】(name) WeChat Wallet, and people in China usually pay through the QR Codes which 【小题6】(produce) through WeChat Wallet, 【小题7】 needs to be connected with users’ bank accounts and then they can start spending immediately.

Almost all vendors get payments through QR Codes. They are being used for bike- renting, grocery shopping, hotel reservation 【小题8】 many other things.

QR Codes are 【小题9】(simple) so popular that some people even use them 【小题10】(collect) donations!

When Peter Sänger and Liang Wu got together, it 【小题1】 (strike) them that they must be long-lost friends. Both firmly advocate the fight 【小题2】 air pollution. They believe that if you can’t measure it, you can’t beat it. That’s 【小题3】 they founded Green City Solutions, the solution to quantifiably improve city air.

Their invention, the CityTree, acts as an air purifier, an interesting 【小题4】 (add) to urban trees and green spaces. Rooted in science, air pollution can be eaten by the vertical flat-paneled (平面的) “trees” 【小题5】 (dot) around cities across Europe, while the “trees” also act as seats for pedestrians. Sänger and Wu’s vision is for a world in which people in cities can live 【小题6】(healthy). They long to create living conditions that allow all people around the world to permanently have cleaner air 【小题7】 (breathe).

The CityTree combines 【小题8】 air-purifying feature of moss with remote technology to increase the air flow through the “trees”. This allows them to “suck up” and clean more air than normal, and the amount they purify can be increased 【小题9】 (depend) on pollution levels at different times of day.

The German green-tech start-up is now funded by the European Commission. A CityTree network of 15 brand new units will be set up and tested in a 【小题10】 (science) way in Berlin’s pollution hotspots next year.

It was not until the 19th century that a few Westerners quietly began noting that the Three Great Inventions were   【小题1】(actual) Chinese. Then in 1925 paper was added to 【小题2】list, so that it became Four Great Inventions instead of just three. However, it was the British scientist Joseph Needham 【小题3】began to popularize the idea of China’s Four Great Inventions in the middle of the 20th century.

Needham 【小题4】(be) a professor at Cambridge in 1937 when three Chinese scientists went there to study. Through one of these scientists, Lu Guizhen, Needham became interested in the history of Chinese science   【小题5】technology. In 1942, Needham【小题6】(send) to Chongqing, China, as the director of the Sino-British Science Co-operation Office. Needham used his time in China【小题7】(travel) to remote provinces for research, and to collect Chinese historical documents on science and technology.

When Needham got back to Cambridge in 1948, he began work on Science and Civilization in China. Here, Needham pointed out numerous Chinese【小题8】(discovery) and inventions, of which the Four Great Inventions were considered 【小题9】 the most important. The first book of this series came out in 1954,【小题10】(result) in a rethinking of China’s role in the development of science and technology around the world. Without this work, the idea of China’s Four Great Inventions might be almost unknown in the West.