单项选择题

What has sometimes caused plants to die out of the past

A．Interference from foresters.
B．Variations in climate.
C．The absence of wooded land.
D．The introduction of new type of plants.
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单项选择题
In line 14, the word spotted could best be replaced by_____.
A．speckled
B．featured
C．noticed
D．damaged
单项选择题
Grandma Moses spent most of her life______.
A．nursing
B．painting
C．embroidering
D．farming
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