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
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单项选择题
The prevailing wind is the wind direction most often observed during a given time period. Wind speed is the rate at which the air moves past a stationary object.
A．motionless
B．massive
C．flexible
D．noticeable
单项选择题
Australia began to assume its modem configuration by the Eocene Epoch, some 50 million years ago, when Antarctica broke away and drifted southward.
A．status
B．sphere
C．shape
D．situation
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