In addition to their (usefulness) as scavengers, birds are of (enormous value) to humans (because) of they eat insects and contr

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问题 In addition to their (usefulness) as scavengers, birds are of (enormous value) to humans (because) of they eat insects and control the (spread) of weeds.

选项 A、usefulness
B、enormous value
C、because
D、spread

答案C

解析
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