第32题: [单项选择]Questions 23 to 25 are based on the conversation you have just heard.[A] They are found under the oceans. [C] Their emissions created earth’s atmosphere. [B] They were most active when earth was first formed. [D] Their fumes are mostly water in the state of a gas. 参考答案:D 答案解析:[听力原文] What aspect of volcanoes does the woman mention