单项选择题

In what way 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
According to the passage, why do people buy tickets to a concert
A．Because they want to know some musicians.
B．Because they want to entertain themselves.
C．Because they want to learn music.
D．Because they don't want to stay home.
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