单项选择题

Crew chiefs supervised engines, switches and lights that told them how each item of equipment was functioning.()

A．observed
B．preserved
C．monitored
D．nurtured

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单项选择题
One of the real services of the historical novel is not that it can be a substitute for history, but that it can be a(n) extension.()

A．compliment
B．supplement
C．instrument
D．replacement
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
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