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 preserved food should retain palatable appearance, flavor, and texture, as well as its original nutritional value.
A．tasty
B．stylish
C．delicate
D．notable
单项选择题
From 1965 to 1978 American consumer prices increased at an average annual rate of 5. 7 percent. This ominous shift was followed by consumer price gains of 13.3 percent in 1979.
A．promising
B．overwhelming
C．threatening
D．astonishing
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