单项选择题

The carpet __________ easily, so try not to spill anything on it.

A．spots
B．marks
C．stains
D．patches
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单项选择题
How do we explain this variation, and how do we explain the __________ of this adaptation from one generation to another
A．transmission
B．transfer
C．transformation
D．transportation
单项选择题
There is no __________ that this will be a serious blow to the government.
A．denying
B．declining
C．ignoring
D．rejecting
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