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| 文章出处：学生大考试站 发布时间：2005-10-12 |
ded 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.
21. What is the passage mainly about?
A) The scientific revolution in the seventeenth century.
B) Reasons that chemistry developed slowly as a science.
C) The practical aspects of chemistry.
D) Difficulties of organizing knowledge systematically.
22. According to the passage, how did knowledge about chemical processes increase before the seventeenth century?
A) Philosophers devised theories about chemical properties.
B) A special symbolic language was developed.
C) Experience led workers to revise their techniques.
D) Experts shared their discoveries with the public.
23. The bold word “hampered” in Line 1 Para 2 is closest in meaning to____.
A) recognized B) determined
C) solved D) hindered
24. The bold word “it” ref
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