The text boxes in the left panel have been placed in a random order. Restore the original order by dragging the text boxes from the left panel to the right panel.
左栏的文本框排列顺序是乱的。请把它们拖到右栏，恢复成原文的正确顺序。
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1Previous studies have shown that humans are unable to recognize melodies whose notes have a fundamental tone above 5 kilohertz.
2As in previous studies, the volunteers could not recognize melodies with fundamental tones above 5 kHz.
3It was thought that, at frequencies this high, the rapidly cycling sound wave was too fast for the auditory nerve to cope with.
4To test this theory, Andrew Oxenham and his colleagues at the University of Minnesota in Minneapolis asked a group of six students whether two four-note melodies were identical or not.
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