单项选择题

Consumer groups have complained that the existing two-company system has led to nearly ______prices and plans.

A．parallel
B．vertical
C．identical
D．specific
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单项选择题
Absolute poverty has fallen steadily since the industrial revolution, which is why yesterday's ______ have become today's necessities.
A．refreshments
B．accommodations
C．entertainments
D．luxuries
单项选择题
Many birds are injured when trying to ______wings with large gaps in the clip.
A．slapped
B．scratched
C．flapped
D．fluctuated
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