The Nanuuts believe that they should not take from Nature anything She cannot replenish during their lifetime. This assures that future generations can　enjoy the same riches of Nature that they have. At the current rate of destruction， the rain forests will disappear during our lifetime. Do we have an obligation to future generations to prevent this result?

　　Here the author trusts that the power of her argument will persuade the reader to answer the question affirmatively.

　　Taking this rhetorical technique one step further， the writer may build up to the conclusion but leave it unstated. This allows the reader to make up his own mind. If the build-up is done skillfully， the reader will be more likely to agree with the author， without feeling manipulated.　

　　Example：

　　Whether the world is Euclidean or non-Euclidean is still an open question.

　　However， if a stars position is predicted based on non-Euclidean geometry，then when a telescope is pointed toswheresthe star should be it will be there. Whereas， if the stars position is predicted based on Euclidean geometry，then when a telescope is pointed toswheresthe star should be it wont be there. This strongly indicates that the world is non-Euclidean.

　　Which one of the following best expresses the main idea of the passage?

　　 The world may or may not be Euclidean.

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