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

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

admin2005-01-30  84
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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