题目内容
A．To choose a topic for a term paper.B．To type some research materials.C．To find mater
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听力原文： For a long time Dr. Jackson had wanted to get a permanent job in a certain big modern hospital, and at last he was successful. He was appointed to the particular position which he wanted, and he and his wife moved to the house which they were now to live in. The next day some beautiful flowers were delivered to them, with a note which said, "Deepest sympathy".
Naturally, Dr. Jackson was annoyed to receive such an extraordinary note, and telephoned the shop which had sent the flowers to find out what the note meant.
When the owner of the shop heard what had happened, he apologized to Dr. Jackson for having made the mistake.
"But what really worries me much more," he added, "is that the flowers which ought to have gone to you were sent to a funeral, with a card which said, 'Congratulations on your new position.'"
(30)
The example of an introvert and an extrovert is used to show that______.
Chemistry did not emerge as a science until after the scientific revolution in the seventeenth century and then only rather slowly and laboriously. But chemical knowledge is as old as history, being almost entirely concerned with the practical' arts of living. Cooking is essentially a chemical process; so is the inching of metals and the administration of drugs and potions. This basic chemical knowledge, which was applied in most cases as a rule of thumb, was nevertheless dependent on previous experiment. It also served to stimulate a fundamental curiosity about the processes themselves. New information was always being gained as artisans improved techniques to gain better results.
The development of a scientific approach to chemistry was, however, hampered by several factors. The most serious problem was the vast range of material available and the consequent difficulty of organizing it into some system. In addition, there 'were social and intellectual difficulties, chemistry is nothing if not practical, those who practice it must use their hands, they must have a certain practical flair. Yet in many ancient civilizations, practical tasks were primarily the province of a slave population. The thinker or philosopher stood apart from this mundane world, where the practical arts appeared to lack any intellectual content or interest.
The final problem for early chemical science was the element of secrecy. Experts in specific trades had developed their own techniques and guarded their knowledge to prevent others from stealing their livelihood. Another factor that contributed to secrecy was the esoteric nature of the knowledge of alchemists, who were trying to transform. base metals into gold or were concerned with the hunt for the elixir that would bestow the blessing of eternal life. In one sense, the second of these was the more serious impediment because the records of the chemical processes that early alchemists had discovered were often written down in symbolic language intelligible to very few or in symbols that were purposely obscure.
What is the passage mainly about？
A．They were offered free dinners for life.B．They were recruited as guards of honor.C．T
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