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 answerENThey bring seeds to this place...Ausing helicopters.Bthree times a year.Cin a security box.保存并进入下一题 →