单项选择题

Why is a "secondary succession" quicker

A. The ground is more suitable.
B. There is more space for new plants.
B. Birds and animals bring new seeds.
D. It is supported by the forest.
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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
The writer would approve an unsuccessful political candidate ______.
A．gave up all his opportunities
B．promised to try again next time
C．overthrew the government by force
D．told the people the truth about his opponent
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