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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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 loss of one or two northern fight whales every year is considered an unaeeeptable loss because they ______.
A．are the only Whales that can sing songs
B．are the only whales capable of masking the clamour of ocean noise
C．provide clues to scientists to study sea currents and waves
D．are on the very verge of distinction
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