单项选择题
A.infected
B.treated
C.butchered
D.killed
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单项选择题
What has sometimes caused plants to die out of the past
A.Interference from foresters.
B.Variations in climate.
C.The absence of wooded land.
D.The introduction of new type of plants.
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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.
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