单项选择题

Though he has suffered from cancer for so many years, it is so strange that he has _______ to the present day. A. deprived B. survived C. derived D. revived

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不定项选择

‍可以通过自上而下寻找论据支撑论点，或是自下而上根据事实作出判断，建造清晰的金字塔思维。‍

A．正确
B．错误

电鳗如何在水中导航和定位猎物？

答案： A.电场感应B.超声波定位正确答案：A答案解析：电鳗通过电场感应来在水中导航和定位猎物。电鳗是一种水生生物，它们在水中生...