解析：
    
    步骤一，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。
 
    步骤二，粗略定位原则
    
    题干表达的含义；各个段落表达的含义
    
    46. The author begins his article with Edmund Burke's words to_____.
    
    作者用Edmund Burke'的话来开篇目的是什么？---定位于第____段
    
    47. Misled people tend to think that using an animal in research is_____.
    
    被误导的人倾向于认为在实验中使用动物是怎样的？---定位于第____段
    
    48. The example of the grandmotherly woman is used to show the public's_____.
    
    祖母年龄状的老太太的例子被用来表明什么？---定位于第____段
    
    49. The author believes that, in face of the challenge from animal rights advocates, scientists should_____.
    
    作者相信，在面对动物权利倡导者的挑战，科学家应该做些什么？---定位于第____段
    
    50. From the text we learn that Stephen Cooper is_____.
    
    通过文章我们得知Stephen Cooper是何许人也？---定位于第____段    

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