围绕本课标题 Over the South Pole 飞越南极（飞越南极的探险）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：In 1929 / three years after his flight over the North Pole / successfully flew over the South Pole / take a great many photographs / ran into serious trouble / at one point / it seemed certain / would crash / rose to 10,000 feet / ordered his men to throw out / cleared the mountains by 400 feet / no more mountains in sight / without difficulty