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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单项选择题
When DK says I wish I knew the answer to that, what he wants to mean is ______.
A．he certainly knows the answer
B．he cannot give a confident answer for the time being
C．he wants to find the answer later
D．he expects others to give a definite answer
单项选择题
According to Donald Kroodsma, ______ as rapid cultural evolution within each generation .
A．whales are as constantly changing their song as birds, creating what is known
B．whales are seldom changing their song in the way we find in birds
C．birds are less often changing their songs than whales are
D．birds would never change their songs as whales would do
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