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.
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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
单项选择题
From Grandma Moses' description of herself in the first paragraph, it can be inferred that she was______.
A．independent
B．pretty
C．wealthy
D．timid
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