围绕本课标题 Volcanoes 火山（火山学家塔捷耶夫）主题，AI 老师会出 若干个简单问题，
每个问题听完后，用 完整句子口头作答。
⚠️ 尽量说完整句子，不要只说一个词；优先用本课句型与词语：spent his lifetime studying active volcanoes / went to Lake Kivu in the Congo / observe a new volcano / named Kituro / set up his camp very close to the volcano / erupting violently / managed to take a number of brilliant photographs / could not stay near the volcano for very long / a river of liquid rock / threatened to surround him completely / managed to escape just in time / climb into the mouth of Kituro / so that he could take photographs / measure temperatures / risked his life / any man alive