A.Through a wide variety of high-frequency sounds. B.Through a wide variety of low-frequency sounds. C.Through their varied swimming gestures. D.Through the echolocation.
拍照语音搜题,微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【多选题】Which of the following can be considered as a purpose for writing a working outline?
A.
Help in organizing the ideas and present the materials in a logical form.
B.
Show the relationships among ideas in the paper writing.