单项选择题

The international Olympic Games, regarded as the world's most prestigious athletic competition, take place once every the four years.

A．regarded
B．prestigious
C．take place
D．every the four years
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A noisy aggressive cousin of the crow, the magpie has those bird's thievish habits.
A．A noisy
B．aggressive
C．those
D．habits
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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