单项选择题

A．developing
B．developed
C．coastal
D．mountainous
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单项选择题
A．Air pollutionB．Water pollutionC．Some diseasesD．All farm land
A．Air pollution
B．Water pollution
C．Some diseases
D．All farm land
单项选择题
What is the main topic of the conversation
[A] The conversion of volcanic waste to fertilizer.
B. The menace of currently dormant volcanoes around Mount Saint Helena.
C. The eruption of Mount Saint Helena and its effects on the environment.
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