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linh3556kenly
2 năm trước
một thửa đất hình chữ nhật có chu vibằng 198 m ,diện tích bằng 2430m^2 .Tính chiều dài và chiếu rộng của thửa đất hình chữ nhật đã cho
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Paper is named for papyrus, a reed like plant used by ancient Egyptians as writing material more than 5000 years ago. The Chinese invented the paper that we use 2000 years ago. A piece of paper is really made up of tiny fibers, unlike a piece of material. The fibers used in paper, however, are plant fibers, and there are millions of them in one sheet. In addition to the plant fiber, dyes and additives such as resin may be used. Dyes can make the paper different colors; resin may add weight and texture. Where do these fibers come from ? The majority of paper is made from the plant fiber that comes from trees. Millions are cut down, but new trees are planted in their place. Paper may be also made from things like old rags or pieces of cloth. Wastepaper, paper that has been made and used, can be turned into recycled paper. This recycling process saves forest, energy and reduces air and water pollution. 1. According to the passage, the paper that we use was first invented by ___________. A. the Chinese B. the Egyptians C. ancient cultures D. foresters 2. What is the main ingredient in most paper? A. resin B. cardboard C. plant fiber D. papyrus 3. According to the passage, the primary source of the plant fiber used in paper is ________ A. rags B. trees C. fabric D. wastepaper 4. According to the passage, recycling paper is ______________ A. bad for the environment C. good for the environment B. wasteful D. economical 5. According to the passage, recycling paper does all of the following EXCEPT ______________. A. reduce the need for ink C. save energy B. save forests D. reduce air pollution

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