第26题: [单项选择]{{B}}Passage One
Questions 26 to 29 are based on the passage you have just beard.{{/B}} A. The first group. B. Tbe second group. C. The last group. D. All the thrcc groups. 参考答案:A 答案解析:[听力原文]
Which group of mice is the healthiest among the three groups after three years
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