单项选择题

A．A round piece of stone.
B．A heavy log.
C．Two slices of log connected at their centers by a strong stick.
D．A piece of metal.
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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
hazardous
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