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entists have preserved the color of meats, but not of vegetables.6.What are nitrates used for?A. They preserve flavor in packaged foods.B. They preserve the color of meats.C. They are the objects of research.D. They cause the animals to bee fatter.7.Which of the following statements is true according to the passage?A. We can always know what are helpful by reading the packaging labels of processed food.B. Medicine that animals take is beneficial to the human beings.C. The farmers give the animals medicine to make the meat cheaper.D. The FDA tried to control the medicine given to animals, but they are not very successful.Questions 8 to 11 are based on the following passage or dialog.There is perhaps, no other sport in the world quite as exciting as skiing. For viewers, it is a spectacle of unsurpassed beauty. For skiers, it is a vivid personal experience, a thrilling test of mind, muscle, and nerves. And more and more, Americans are discovering this thrill for themselves. Not too long ago, skiing had virtually no part in the American sports scene. If it was thought of at all, it was purely as a European sport. Then came the 1932 Winter Olympics at Lake Placid, New York. Americans got their first good look at skiing and made for the hills. Today ski trains make regular runs from our cities to the great, white outdoors. Lodges dot the mountain sides offering skiers the warmth of their firesides.In addition to joy and excitement, skiing offers other attractions. It is a paratively inexpensive sport, and, for the young, the art of skiing is often mastered in a very short time.The special thrill of skiing is well described by Buddy Werner. It is all up to you, he says. No teammates can help. You39。re alone. It39。s you against the snow, the mountains, yourself. You39。re a warrior (勇士).8.By the expression made for the hills (Para 1), the writer means that ________________