单项选择题

In the past, most foresters have been men, but today, the number of women __________ this field is climbing.

A．engaging
B．devoting
C．pursuing
D．registering
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单项选择题
The carpet __________ easily, so try not to spill anything on it.
A．spots
B．marks
C．stains
D．patches
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
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