单项选择题

What conditions are needed for shrubs to become established

A．Ferns must take root.
B．The ground must be covered with grass.
C．More soil must accumulate.
D．Smaller plants must die out.
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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.
单项选择题
The fox, in this passage, is ______.
A．admired for his trickery
B．no match for the lion
C．pitied for his trick
D．considered worthless
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