标题: WEAKEN题！难！期待解答 [打印本页] 作者: tristacn 时间: 2009-11-12 12:11 标题: WEAKEN题！难！期待解答 As a practical matter, the copper available for industrial use should not be thought of as limited by the quantity of copper deposits, known or unknown. The transmutation of one chemical element into another is a modern reality, through the methods of nuclear physics. Therefore, the quantity of a natural resource such as copper cannot be calculated even in principle, because copper can be made from other metals.
Which of the following, if true, is the strongest argument against the argument above?
(A) Although it is possible that additional deposits of copper will be found, geological considerations strongly indicate that they will not amount to more than a fifty-year supply.
(B) The production of copper from other metals in industrial quantities would be prohibitively expensive in energy and materials.
(C) Synthetic materials have been discovered that can serve as practical substitutes for copper in most of its uses.
(D) It will be impractical, in the foreseeable future, to mine any deposits of metal that may exist on the Moon or on other planets.
(E) Methods for estimating the amount of copper available in currently known deposits have become very sophisticated and have proved quite accurate.作者: verylotus 时间: 2009-11-12 12:50
是选B吗作者: tristacn 时间: 2009-11-12 13:29
是的 请问如何思考呢作者: verylotus 时间: 2009-11-12 15:11
As a practical matter, the copper available for industrial use should not be thought of as limited by the quantity of copper deposits, known or unknown. The transmutation of one chemical element into another is a modern reality, through the methods of nuclear physics. Therefore, the quantity of a natural resource such as copper cannot be calculated even in principle, because copper can be made from other metals. 铜的数量不应该被认为受到铜矿存储量的限制。通过核物理的方法，化学物之间的转换已经成为现实，所以，自然资源例如铜的数量不应该被计算，因为铜可以从其他物质制造 削弱：制造代价太大作者: tristacn 时间: 2009-11-12 15:25
还是不是太明白，是制造代价大所以不应被计算，属于他因削弱吗？制造代价大跟计算自然资源的数量有什么关系呢？盼回复 谢谢~作者: verylotus 时间: 2009-11-12 16:36
可能是我翻得不太好吧。。原文说不要这么斤斤计较铜的存储数量了，原因是反正铜可以从其他物质转变而来 削弱：虽然可以转，可是好贵，花费代价太大，所以还是要在乎自然界的铜的作者: tristacn 时间: 2009-11-12 17:45
好的 太感谢你了 方便留QQ吗 多多交流 O(∩_∩)O~作者: verylotus 时间: 2009-11-12 17:58
呵呵，我现在几乎不上QQ的，ＣＤ倒是天天上的，要找我的话在站内给我发短消息吧 ＭＭ什么时候考呀
