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
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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
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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