单项选择题
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A．$250.
B．$450.
C．$550.
D．$125.
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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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