单项选择题

According to the passage, Grandma Moses began to paint because she wanted to _____.

A．decorate her home
B．keep active
C．improve her salary
D．gain an international reputation
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单项选择题
In a primary succession , what makes it possible for mosses to take root
A．The type of rock.
B．The amount of sunlight.
C．The amount of moisture.
D．The effect of lichens.
单项选择题
What conditions are needed for shrubs to become established
A．Ferns must take root.
B．The ground must be covered with grass.
C．More soil must accumulate.
D．Smaller plants must die out.
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