单项选择题

A．role
B．lead
C．virtue
D．roll
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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
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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