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  3. What is the passage mainly about? According to the passage, how did knowledge about chemical processes increase be fore the sev

What is the passage mainly about? According to the passage, how did knowledge about chemical processes increase be fore the sev

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问题 What is the passage mainly about?
According to the passage, how did knowledge about chemical processes increase be fore the seventeenth century?
选项 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.
答案D
解析 从第一段可知：化学作为一门科学始于17世纪科学革命之后，当时的发展是相当缓慢费劲的，但化学知识却同历史同步。在成为科学之前，人们把化学知识凭经验应用在许多方面，一些手艺人不断改进技术来获得更好的结果。这说明，在17世纪之前，人们化学知识的积累主要是因为行家与大众共享他们的发明。应用，然后改进。
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