单项选择题

It can be inferred that Flamel was believed ______.

A．to have spend 25 years with "Abraham the Jew"
B．to be the creator of the philosopher's stone
C．to be the founder of alchemy
D．to have cast light on Newtonian mechanice

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单项选择题

The word pedestrian (in boldface in Paragraph 5) is closest in meaning to ______.

A．secret
B．illegal
C．ordinary
D．dishonest

单项选择题

The passage shows that alchemy in the medieval time ______.

A．established modern chemistry
B．cured all the diseases
C．turned base metals to gold
D．was taken as somewhat justifiable