新GRE 新东方绿皮填空3.5 For centuries,animals have been used as __ for people in experiments to assess the effects of therapeutic and other agents that might later be used in humans.A.benefactorsB.companionsC.examplesD.precedentsE.surrogates
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![新GRE 新东方绿皮填空3.5 For centuries,animals have been used as __ for people in experiments to assess the effects of therapeutic and other agents that might later be used in humans.A.benefactorsB.companionsC.examplesD.precedentsE.surrogates](/uploads/image/z/12025546-34-6.jpg?t=%E6%96%B0GRE+%E6%96%B0%E4%B8%9C%E6%96%B9%E7%BB%BF%E7%9A%AE%E5%A1%AB%E7%A9%BA3.5+For+centuries%2Canimals+have+been+used+as+__+for+people+in+experiments+to+assess+the+effects+of+therapeutic+and+other+agents+that+might+later+be+used+in+humans.A.benefactorsB.companionsC.examplesD.precedentsE.surrogates)
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