单项选择题

What does the forest strike mankind as permanent

A．The trees are in community.
B．The forest is renewed each season.
C．Man's life is short in comparison.
D．It is an essential part our lives.
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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 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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