ExercisesDownloads打开原始音频 / 视频 →B1+ LISTENING TESTSQuestion 1 / 5请完成全部题目,最后查看答案与解析LISTENING · B1+ ▶Listen and answerENThe Hyperloop is going to use ...ASolar energy.BThe energy from the vacuum created in the tube.CThe vacuum and fuel.保存并进入下一题 →