单项选择题

A．Air pollution
B．Water pollution
C．Some diseases
D．All farm land
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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.
单项选择题
This news story most probably appeared in a newspaper in ______.
A．1986
B．1987
C．1995
D．1997
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