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
Why is a secondary succession quicker
A．The ground is more suitable.
B．There is more space for new plants.
C．Birds and animals bring new seeds.
D．It is supported by the forest.
单项选择题
The writer suggests that a successful leader must ______.
A．be prudent and faithful
B．cheat and lie
C．have principle to guide his actions
D．tell the people the truth about his opponent
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