单项选择题
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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.
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repeatedly
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