当前位置：The speaker is certain
判断题 The speaker is certain that there will be quieter and more fuel-efficient supersonic passenger jets for long-haul lights in the future.（）
对
错
正确答案：错
答案解析: 录音中指出“若技术上再有稍微的突破，声音更小、更节能高效的超音速客机或许能成为现实”，录音中提到的viable指“切实可行的；有望实现的”，可见说话者只是推断并非是确信，因此题干表述过于绝对。
【录音原文】Still, one day, demand for fast long-haul flights could return.With only a modicum of technological progress, a quieter, more fuel-efficient supersonic passenger jet could be viable.
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