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Tham khảo tài liệu 'toefl stucture bank part 9', ngoại ngữ, toefl - ielts - toeic phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 20. In the 1800 s daguerreotypes were used a greatest deal especially for portraits. 21. Vervet mons have a well-developed systems vocal communication. 22. The invention of a cotton gin by Eit Whitney in 1793 made cotton yarn more economy than linen yarn. 23. Scientists has found that the saliva of the octopus contains a substance that functions as a powerful heart stimulant. 24. The katydid a type of grasshopper is actively at night and rests motionless amid foliage during the day. 25. Soap is used as a lubricant in making tiny wires for electrical appliances such television sets and telephones. 26. Although the art of sand painting originated with neighboring Pueblo Indians the Navajo Indians have refined and richly reinterpreted they symbology and execution. 27. In 1967 Canada s year centennial one and a quarter million people from all over the world visited Parliament Hill in Ottawa. 28. The General Sherman tree a giant sequoia in California has grown to be the world s largest plant at approximate 272 feet tall. 29. Since the turn of the century the number of Native Americans living in Canada is increased. 30. Eleanor Roosevelt played a leading part in women s organizations and she was active in encouraging youth movements in promoting consumer welfare and to work for civil rights. 31. Nutrients are substances neither occurring naturally or in synthetic form that are necessary for maintenance of the normal functioning of organisms. 32. Even in an age of experimentation and departures from convention the sonata form remain among the most vital means of musical expression. 81 33. Researchers have found many ways of treating paper so that it will be strong fireproof and resistance to liquids and acids. 34. Because its body is supported by water the blue whale can grow to a size considerable large than any land mammal alive today. 35. Langston Hughes a prolific writer of the 1920 s was concerned with the depicting the experience of urban Black people in the United
