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            • 1． Air pollution is a killer． The World Health Organization says it kills about seven million people around the world each year． Even if (1) （pollute） air does not kill us， it can make us very sick． (2) （wear） face masks， people walk past heavy traffic as Beijing is hit by a sandstorm． The government in Beijing issued a blue warning on air pollution as sandstorms swept through the Chinese capital city．
              However， breathing in dirty air (3) （frequent） may do more harm to your body， (4) can also affect your brain and your ability to think． A new study shows that air pollution can cause a huge decrease in our (5) （intelligent）．The researchers reported that long term suffering air pollution can affect a person"s mental abilities in two (6) （area）：language and math．
              The researchers studied about 25，000 people from across China． Between 2010 and 2014， these Chinese men， women and children (7) （give） language and math tests． The researchers found that breathing in (8) air which has been polluted can reduce a person"s education level by about one year． The effect generally is even (9) （bad）for those over years of age， for men and for those with little or no education． The researchers noted that the effect of pollution (10) language ability is even more serious as people age， especially among men and the less educated．
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            • 2． ___________
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            • 3．           ​
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            • 4．     High-speed railways, electronic payments, shared bicycles and online shopping are China's four new ways of life. They are most appealing to youths from 20 countries participating   (1)   the Belt and Road Initiative. The new four great inventions are all related to China's high-tech innovation,   (2)   has improved the quality of people's lives, "my wallet is no longer in use. I can buy and eat whatever I want   (3)   (simple) with a tap of my phone," said Lin Jinlong, an overseas Chinese student from Cambodia,   (4)   (add) that even pancake sellers are using Alipay (mobile payment)...
                  In   (5)   word, China is leading in many ways. Bike sharing, for example, is not new itself. But China has made it much more convenient and   (6)   (enjoy) both in China and overseas. Leading Chinese bike-sharing   (7)   (company), Mobike and Ofo are now operating in foreign countries such as Singapore and Britain. Users in the countries   (8)   (feel) excited and posted photos of   (9)   (they) riding the Chinese bikes on social media. A growing number of foreigners  hope   (10)   (promote) economic development in their home countries by paying more attention to the achievement of China.
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