单项选择题

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

A. discern
B. grasp
C. measure
D. estimate

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单项选择题
I knew nothing of the motives behind his recent move, and I don’t know either the person to put him up to the action.（）

A. nor did I know... who
B. not did I know... that
C. nor do I know... that
D. either did I know... who
单项选择题
I see four kinds of pressure working on college students today: economic pressure, parental pressure, peer pressure, but self-induced pressure.（）

A. and
B. or
C. Nil
D. with
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