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5.The scientists have designed manyexperiments(实验) to test the ability of dogs to see colour.

分析 科学家设计了许多实验来测试狗的识别颜色的能力.

解答 答案:experiments.根据关键词many可知其后应该跟可数名词的复数形式;结合给出的汉语"实验"为名词experiment,复数为experiments.故填写:experiments.

点评 本题考察词汇的掌握程度及名词复数,在熟练的基础上可正确作答.

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