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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1Echolocation is adaptive only in an ecological niche where vision is impossible or badly impaired—for instance, when dwelling in caves and hunting at night, as bats do.
2Vision and echolocation have many features in common.
3Why, then, is vision so common and echolocation so rare?
4One narrow range of radiation — light in the case of vision, ultrasounds in the case of echolocation — provides information relevant to a wide variety of cognitive and practical goals.
5Because, in most environments, vision is much more effective.
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