Topic Sentence：____________________________________________

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　　Listing Signals：_____________________________________________

　　Steps： 1.______________________________________________

　　2.______________________________________________

　　3.______________________________________________

　　4.______________________________________________

　　Exercise 11-2

　　Directions：The sentences below constitute a paragraph on the scientific methods.However，the sentences have been given in a disordered sequence.You should place them in their correct order.

　　a.Following this method，the reseacher first observe some aspects of nature and then poses a specific question about what he has observed.

　　b.Experiments based on this hypothesis are designed and conductedto test each contingency.

　　c.In order to answer this question，potent data are collected.

　　d.After thorough experimentation，the researcher validates，modifies，or rejects his original hypothesis.

　　e.Originating from the branch of philosophy called epistemology，what we now know as the scientific method provides guidelinesf of the systematic acquisition of knowledge.

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