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
A corps of so-called barefoot doctors are trained in hygiene, preventive medicine, acupuncture, and routine treatment of common diseases.
A．nutrition
B．sanitation
C．nursery
D．welfare
单项选择题
The chief functions of direct-mail advertising are to familiarize prospective buyers with a product, its name, its maker, and its merits and with the product's local distributors.
A．potential
B．responsive
C．inquisitive
D．perceptive
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