单项选择题


A．lower
B．less
C．more
D．higher
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单项选择题
A．withB．throughC．byD．in
A．with
B．through
C．by
D．in
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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