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
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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