InterviewSolution
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                                    1). PQSTR2). QSPRT3). RQSTP4). SQRPT | 
                            
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Answer»  The first sentence in a PARAGRAPH ALWAYS INTRODUCES a new topic and must be a sentence with independent meaning. Here, only sentence S introduces the topic of 'snake venom'; while others give more information about it. so, S must be the first$ sentence.$ Out of the given options, only option 4 REFLECTS this order. Therefore, the CORRECT answer is option 4.  | 
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