单项选择题

A．The Philippines.
B．Mexico.
C．Brazil.
D．Guatemala.
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单项选择题
A．It served as a fertilizer for crops.B．It formed a new mountain.C．It stabilized air temperatures.D．It destroyed various insect pests.
A．It served as a fertilizer for crops.
B．It formed a new mountain.
C．It stabilized air temperatures.
D．It destroyed various insect pests.
填空题
repeatedly
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