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The American football sport, originating from the Engl......

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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
Why do some birds vary from place to place in their song repertoires of according to DK
A．It comes about perhaps because of the change of their DNA.
B．It comes about simply due to imitation of the other birds' manner.
C．Because the birds have learned the local dialect by learning the local dialect from generation to generation.
D．Both A and
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