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.

　　67．John Sauven holds that ________.

　　A．many people value nature too much

　　B．exploitation of wildernesses is harmful

　　C．wildernesses provide humans with necessities

　　D．the urge to develop the ecosystem services is strong

　　68．What is the main idea of Para.3?

　　A．The exploitation is necessary for the poor people.

　　B．Wildernesses cannot guarantee better use of raw materials.

　　C．Useful services of wildernesses are not the reason for no exploitation.

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