问答题
分析外部效应的特点，并举例说明。
分析外部效应的特点，并举例说明。
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单项选择题
3. Natural processes such as earthquakes, landslides, floods, volcanic eruptions, tornadoes, and hurricanes are considered when they occur in populated areas.
3. Natural processes such as earthquakes, landslides, floods, volcanic eruptions, tornadoes, and hurricanes are considered when they occur in populated areas.
A．hazards
B．tenet
C．erosion
D．landslides