单项选择题

Agriculture was a step in human progress（）subsequently there was nothing comparable until our own machine age．

A．to which
B．with which
C．from which
D．in which

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单项选择题
Not until the advent of histochemistry could the anatomist see through the microscope which cells carry specific enzymes or gauge how active these enzymes are in different cells under various conditions（）

A. discern
B. grasp
C. measure
D. estimate
单项选择题
As far as rank is concerned, an associate professor is（）to a professor, though they are almost equally knowledgeable.

A. attached
B. subsidiary
C. previous
D. inferior
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