求与三个点A（3,7,-4），B（-5,7, -4），C（-5,1, -4）的距离都相等的点的轨迹． - 查题网

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高等继续教育 / 高等数学2

求与三个点A（3,7,-4），B（-5,7, -4），C（-5,1, -4）的距离都相等的点的轨迹．

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高等数学2

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1[阅读题] There once lived in China a very foolish king and queen. One day the queen had a baby daughter. When they saw their baby, they both cried out, “My goodness! How small it is! It’s hairless and toothless! It’s a monster!” They sent for all the doctors in the country and ordered them to prepare some medicine for her. “When she drinks your medicine, she must grow to the right size and have hair and teeth,” the king said, “If you don’t do this, you’ll have a beating.” The doctors thought it impossible, but they dared not say anything against the king’s order. Just then and old doctor stepped forward. “Oh, we shall certainly obey your order,” he said, “but it takes time. We have to dig a mineral from the KunLun Mountains when the snow melts for the second time. The snow melts on those mountains only once in six years. So we need twelve years.” At last the king agreed and the doctors took away the little princess. On her twelfth birthday, they brought her back to her parents with long black hair and beautiful teeth. The king and queen were very happy and gave the doctors expensive presents. ( )1.Which of the following words makes the sentence untrue? The baby was ______. A. Toothless B. hairless C. unusual D. small ( )2.The doctors would be beaten if ______. A. the baby daughter didn’t drink their medicine B. they refused to obey the king’s order C. the baby daughter grew to the right size D. the baby daughter became a monster ( )3.The old doctor wanted to keep the king’s daughter for twelve years because ______. A. they needed a lot of different plants B. they need a lot of different minerals C. this would give the baby time to grow up D. they had to dig a mineral the snow melted for the second time ( )4.The doctors thought it impossible ______. A. for them to change the king’s order B. for them the prepare the medicine in twelve years C. for the small baby to drink the medicine D. for them to make the baby have teeth and hair or grow teeth at once ( )5. ______ the king wouldn’t have given them expensive presents. A. Had the doctors not brought back a beautiful girl B. If the doctors hadn’t found the minerals C. Had the doctors not been able to prepare the magic medicine D. If the daughter were still a monster twelve years later大学英语（III）