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ey are good for school children. C. They cannot harm school children. D. We are not told. B The Chinese invented paper in 105 A. D. They mixed the bark of a tree and rags (破布) with water, put a screen into the mixture, and lifted out a thin piece of wet paper. They dried the paper in the sun. The Chinese kept their secret of how to make paper until a war with Muslims in the ninth century. The art of papermaking soon spread throughout the Muslim world. The Mayan Indians in Central America and Pacific Islanders also discovered how to make paper, but their knowledge never spread to the rest of the world. For centuries, all paper was made by hand. Rags were the main material. Then a French scientist discovered that people could make paper from wood, too. Finally, in the eighteenth century. a Frenchman invented a machine to make paper from wood.64. Who discovered how to make paper?A. The Chinese. B. The Pacific Islanders.C. The Mayan Indians. D. All of the above.65. When did the Chinese invent paper according to the passage?A. About 1 ,800 years ago. B. About 1, 900 years ago.C. About 2, 000 years ago. D. About 2, 100 years ago.66. How was papermaking introduced into the rest of the world from China?A. Through wars. B. Through the Muslims.C. Through the Mayan Indians. D. Through the Pacific Islanders.67. Which of the following is the best title for this passage?A. The Invention of Paper. B. The History of Papermaking.C. Different Ways of Making Paper. D. The Invention of a Papermaking Machine. CUntil late in the 20th century, most Americans spent time with people of generations. Now midaged Americans may not keep in touch with old people until they are old themselves. That’s because we group people by age. We put our threeyearolds together in daycare center, our 13yearolds in school and sports activities, and our 80yearolds in seniorcitizen homes. Why? We live away from the old for many reasons: young people sometimes avoid the old to get rid of fears for aging and dying. It is much harder to watch someone we love disappear before our eyes. Sometimes it’s so hard that we stay away from the people who need us most.Fortunately, some of us have found our way to the old. And we have discovered that they often save the young.A reporter moved her family onto a block filled with old people. At first her children were disappointed. But the reporter baked banana bread for the neighbors and had her children deliver it and visit them. Soon the children had many new friends, with whom they shared food, stories and projects. “My children have never been less lonely,” the reporter said.The young, in turn, save the old. Once I was in a rest home when a visitor showed up with a baby. She was immediately surrounded. People who hadn’t gotten out of bed in a week suddenly were ringing for a wheelchair. Even those who had seemed asleep wake up to watch the child. Babies have an astonishing power to fort and cure.Grandparents are a