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.
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单项选择题
Which of the following would be the best title for the passage
A．Grandma Moses: A Biographical Sketch
B．The Children of Grandma Moses
C．Grandma Moses: Her Best Exhibition
D．Grandma Moses and Other Older Artists
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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