Read the following article and select the best answer. Article: BEIJING--As China scrambles to respond to the choking smog that has _ Beijing in recent weeks, authorities in several major cities are experimenting with carbon trading platforms. The schemes are one effort to get control over greenhouse gases in an economy still hungry for cheap energy. It has been a persistent concern in recent years, but the spiking pollution levels in January are sparking a public outcry. Emissions from coal-fired electricity plants and busy factories are part of the problem that officials hope to get control over through carbon trading platforms. Seven cities are expected to open carbon markets later this year, including Tianjin. "The government has decided to start with programs because the carbon trading is something new to China," said David Tang, secretary of the board of the Tianjin Carbon Exchange. "So we want to have a number of programs to explore the use of the market." said Tang. China wants to launch a national carbon trading program by 2016. If it is successful, analysts say, the program would be one of the largest in the world and would help the country meet its target of cutting carbon dioxide emissions by 45 percent within seven years. The platforms allow companies to earn credits for lowering greenhouse gas emissions, which can then be traded. If it works, it would encourage for-profit businesses to invest in green technology. As public concern builds pressure for the government to find a solution, Wu Changhua, greater China director of the Climate Group, says there is a broad shift under way in how Chinese weigh their quality of life. China has long put economic growth ahead of environmental concerns, making it the world's biggest polluter. Carbon trading supporters hope that the markets could be one way to curb pollution and keep the economy growing. Question: Which of the following is TRUE about carbon trading platforms? - They are used to trade various resources. - They caused the choking smog in China. - They have been in existence for many years in China. - The choking smog may promote their development.
The choking smog may promote their development.

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Read the following article and select the best answer. Article: If you're in Florence, Italy, and see a man on a ladder wiping the dust off statues and buildings, don't worry.It's just Alessandro Ricci gathering material for his famous smog paintings. Ricci is not a common artist, because he used smog as the main medium of his artworks. Unlike other painters seeking fast recognition of their talent, he doesn't really care about "being this big artist".Instead he is more concerned about bringing attention to how much smog there really is in his home town and how it's destroying both its monuments and people. Although he did take a couple of art classes a few years back, he is mainly self-taught, doesn't work in a studio, donates most of his work, and refuses to play by the rules of the Florentine Art Gallery, which he considers corrupt.Alessandro Ricci believes selling his smog paintings will not only compromise his principles, but also contradict the very thing he's trying to do-raise awareness about smog pollution in this city. Alessandro lives with his parents nearby Florence, but almost every day he visits the streets of the city, and collects smog for his paintings.He gets it from several meters above ground, from clean surfaces like marble, plastic and stone, using damp pieces of cotton.Then he applies the smog directly onto a cloth and creates street scenes and reproductions of the very buildings from which he got the dangerous material.Finally, he seals his paintings with a natural resin . His actions helped win a small victory for the people of Florence, as in October 25, 2012 the Duomo area of the city was made pedestrian-only.But there is still a long way to go, the artist believes, and only cleaning the thick layer of smog that has accumulated throughout Florence would take several years.Still, he continues to paint his unique smog artworks and let the people know how polluted the environment they live in really is. Question: Ricci paints his unique smog artworks aiming to _ . - fight government corruption - advertise the monuments - create more street scenes - raise awareness about pollution
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raise awareness about pollution

Read the following article and select the best answer. Article: Do you know Australia ? Australia is the largest island in the world . It is a little smaller than China . It is in the south of the earth .Australia is big , but its population is not large . The population of Australia is nearly as large as that of Shanghai . The government has made enough laws to fight pollution . The cities in Australia have got little air or water pollution .The sky is blue and the water is clean . You can clearly see fish swimming in the rivers . Plants grow very well . Last month we visited Perth , the biggest city in Western Australia , and went to a wild flowers' exhibition . There we saw a large number of wild flowers we had never seen before . We had a wonderful time .Perth is famous for its beautiful wild flowers .In spring every year Perth has the wild flowers' exhibition .After visiting Perth, we spent the day in the countryside . We sat down and had a rest near a path at the foot of a hill .It was quiet and we enjoyed ourselves . Suddenly we heard bells ringing at the top of the hill .What we saw made us pick up all our things and run back to the car as quickly as we could .There were about three hundred sheep coming towards us down the path . Australia is famous for its sheep and kangaroos . After a short drive from any town , you will find yourself in the middle of white sheep . Sheep , sheep , everywhere are sheep . Question: Which of the following NOT true ? - Perth is famous for its beautiful wild flowers . - Perth is bigger than any other city in Western Australia . - Perth lies in the west of Australia . - No other city is larger than Perth in Australia .
No other city is larger than Perth in Australia .