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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相关考题
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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 -
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.
