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Is Lei Feng Spirit Outdated
As the w......

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单项选择题
Birds that live on the boundary between two dialects or that spend time in different areas, according to Donald Kroodsma, can become bilingual, ______. Ⅰ. ff they are living on the boundary between two dialects Ⅱ. when they move or stay in different areas Ⅲ. on the condition that they are thrown together and forced to learn the songs of their neigh-bors’ songs
A．Ⅰ and Ⅱ
B．Ⅱ and Ⅲ
C．Ⅰ and Ⅲ
D．Ⅲ only
单项选择题
The word nomadic in the sentence How is this affected by whether a bird is nomadic. can best probably mean ______.
A．living in the north
B．immigrant according to seasons
C．'immigrant from place to place irregularly
D．feather changing according to seasons
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