解析：
    
    指点一、中心统一原则
    
    首段---主题句；其他段落---段落中间转折词所在句或段首句
    
    首段： Hearing allegations of cruelty to animals in research settings, many are perplexed that anyone would deliberately harm an animal. 听说在实验场景中残忍的对待动物的宣传，许多人不禁感觉到迷惑，有人故意伤害动物。
    
    其他段落：For example, a grandmotherly woman staffing an animal rights booth at a recent street fair was distributing a brochure that encouraged readers not to use anything that comes from or is tested in animals---no meat, no fur, no medicines.例如，一位祖母年龄状的老太太在最近的街边集市上摆了保护动物的摊子，向路人散发保护动物权利的小册子……
    
    Scientists must communicate their message to the public in a compassionate, understandable way---in human term, not in the language of molecular biology.科学家必须与公众们沟通交流（以……的方式）。
    
    Much can be done.很多事情能够被做。（能够采取措施）
    
    总结：文章围绕着______主题展开。 
    
    

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