单项选择题


A．fruit
B．fruitful
C．failure
D．fruitless
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单项选择题
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 chemical knowledge systematically.
单项选择题
Which of the following statements best explains why the second of these was the more serious impediment (Underlined )
A．Chemical knowledge was limited to a small number of people.
B．The symbolic language used was very imprecise.
C．Very few new discoveries were made by alchemists.
D．The records of the chemical processes were not based in experiments.
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