单项选择题


A．lower
B．less
C．more
D．higher
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单项选择题
A．harmfulB．profitableC．healthyD．useful
A．harmful
B．profitable
C．healthy
D．useful
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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