not，he argues，a

　　reason

　　to

　　avoid

　　all

　　human presence，or indeed commercial and industrial exploitation.There are ever more people on the Earth，and they reasonably and rightfully want to have better lives，rather than

　　merely struggle for survival.While the ways of using resources have improved，there is still a growing need for raw

　　materials，and some wildernesses contain them in abundance.If they can be tapped without reducing the services those wildernesses provide，the argument goes，there is no further reason not to do so.Being untouched is not，in itself，a characteristic worth valuing above all others.

　　I look forward to seeing these views taken further，and to their being challenged by the other participants.One

　　challenge that suggests itself to me is that both cases need to take on the question of spiritual value a little more directly.And there is a practical question as to whether wildernesses can be exploited without harm.

　　This is a topic that calls for not only free expression of feelings，but also the guidance of reason.What position wilderness should enjoy in the preservation of the world obviously deserves much more serious thinking.

　　Which of the following shows the structure of the passage?

　　CP：Central Point　P：Point　Sp：Sub­point(次要点)

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