单项选择题

The Social Security Act did not include health insurance because the commission considered that its inclusion would jeopardize the passage of the act.

A．evade
B．endanger
C．exclude
D．enhance
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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
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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