ExercisesDownloads打开原始音频 / 视频 →B1 LISTENING TESTSQuestion 1 / 6请完成全部题目,最后查看答案与解析LISTENING · B1 ▶Listen and answerENSaudi Arabia...Ais the biggest producer of oil and gas.Bis the richest country.Cwas a very poor country.保存并进入下一题 →