单项选择题

What is the main topic of the conversation

A．It served as a fertilizer for crops.
B．It formed a new mountain.
C．It destroyed various insect pests.
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单项选择题
A．He was hit by a car.B．He was almost hit.C．He was ill.
A．He was hit by a car.
B．He was almost hit.
C．He was ill.
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