单项选择题

Although diverse, African music has certain distinctive traits, one of which is the use of repetition as an organizing principle.

A．benefits
B．features
C．notions
D．options
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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
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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