A-A+
According to the second paragraph crows are p
问题详情
According to the second paragraph, crows are poor subjects for field research for all the following reasons EXCEPT ______.
A．they can successfully avoid observers
B．they are hard to distinguish from one another
C．they can be quite aggressive
D．they are difficult to catch
参考答案
正确答案：C
解析：细节定位题。 根据第2段的内容运用排除法，A项：它们能成功地逃避观察；B项：很难辨认它们的不同，C项；它们很好斗，D项；它们很难抓。其中选项A，B，D都有提到，唯独选项C没有提到，故C项正确。
