【单选题】听力原文: The volcanic ash from the eruption of Mount Saint Helens certainly caused a lot of damages, didn't it? It did, but not as much as experts had predicted. It seems to have a beneficial effect as w...
A.
The conversion of volcanic waste to fertilizer.
B.
The menace of currently dormant volcanoes around Mount Saint Helens.
C.
The eruption of Mount Saint Helens and its effects on the environment.