单项选择题

Which of the following words could best replace the word "one" (Underlined)

A．Oil.
B．Door.
C．Store.
D．Product.
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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 on experiments.
单项选择题
The bold word it refers to which of the fallowing
A．Problem.
B．Material.
C．Difficulty.
D．System.
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