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The truth___1___trees are vital to our life is not a secret. They provide us with food£¬wood and most ___2___(important)£¬oxygen. Now there is one more thing we can add to this list¡ªblocking out harmful bacteria from water.

The discovery__3__(make) by a team consisting of scientists from the Massachusetts Institute of Technology (MIT) and high school students__4__were seeking a natural water filter¡ªone that would help communities in developing countries that do not have__5__(accessible) to modern water filter systems.

The__6__(research)£¬led by Professor Rohit Karnik£¬decided to turn to trees for help because they could allow liquid to flow through£¬while blocking out air bubbles.

They began by cutting 1.5-inch-wide sections of tree bark from the branches of a white pine tree. The people related then tested the wood's filtering ability by pouring water__7__(contain) red dye particles of different sizes through.__8__their amazement, they found that it was effective in trapping all the particles.__9__(encourage), the team conducted__10__experiment£¬this time with water that contained bacteria. Sure enough£¬the sapwood held back 99% of the bacteria£¬allowing only 1% to flow through.

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Chengdu has dozens of new millionaires, Asia¡¯s biggest building, and fancy new hotels. But for tourists like me, pandas are its top 1 (attract).

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On my recent visit, I help a lively three-month-old twin that had been rejected by 8 (it) mother. The nursery team switches him every few 9 ( day) with his sister so that while one is being bottle-fed, 10 other is with mum-she never suspects.

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With the development of modern society and high technology, children wear more and more beautiful and fashionable clothes. More children 1 (allow) to choose their favorite clothes, which is 2 relatively new trend. Many years ago, children had to suffer the whims(Í»·¢ÆæÏë)of adults as far as clothes were concerned. Like 3 (adult) clothes, children¡¯s clothes followed fashions as well. About 120 years 4 , boys in Europe and America wore white ankle-length dresses, just like their sisters, until they 5 (reach) the age of five. Older boys from wealthy 6 (family) were then dressed in pretty velvet(Ë¿ÈÞ) suits 7 lace collars. Their hair was grown to shoulder length 8 longer. For many unlucky boys, these carefully planned and organized costumes were nor reserved for special occasions; they had to wear the same 9 (restrict)and uncomfortable outfits for everyday play. Clean and proper clothes say that the person has both self-respect and respect for other people. Clothing can tell quite a lot about the person, sometimes more than we would like to reveal. So we should pay more attention to 10 (wear) proper clothes in different occasions.

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