单项选择题
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.
A. She refused the man’s request. B. She recommended the man an expensive apartment. C. She wanted to sell her apartment.
A. A final copy of the research project. B. Copies of the midterm. C. A few pens.