单项选择题

Our plan didn’t get up the ground because no one could come.（）

A. get over
B. get on
C. get off
D. get through

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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

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

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