请教og-verbal中的逻辑第76题。谢谢啦！

LTT12345

76．Country Y uses its scarce foreign-exchange reserves to steel thus produced earns more foreign exchange than has vast deposits of iron ore，which can be mined with buy scrap iron for recycling into steel．Although the it costs，that policy is foolish．Country Y's own territory minimal expenditure of foreign exchange．

Which of the following，if true，provides the strongest support for Country Y's policy of buying scrap iron abroad?

(A)  The price of scrap iron on international markets rose significantly in 1987．

(B)  Country Y's foreign-exchange reserves dropped significantly in 1987．

(C)  There is virtually no difference in quality between steel produced from scrap iron and that produced from iron ore．

(D)  Scrap iron is now used in the production of roughly half the steel used in the world today, and experts predict that scrap iron will be used even more extensively in the future．

(E)  Furnaces that process scrap iron can be built and operated in Country Y with substantially less foreign exchange than can furnaces that process iron ore．

D选项为什么不行？OG给的解释我不是很理解。D  The increasing use of scrap iron for recycling into steel suggests that it is a good alternative to mining iron ore，but this statement is general and does not address the particular problems of a country that must use scarce foreign-exchange reserves to buy the scrap iron

JamesYi

兄弟，你的题干好象不太通。

D,OG中的解释很正确。虽然世界形势是Scrap iron 普遍使用，但是根据本国情况来说，D　并没有说明为什么对于我国外购铁矿石比在本国开采更划算．Ｄ是一个无关选项．换句话说，即使Ｄ中所描述的内容正确，仍然有可能在本国开采其实更划算，即反对提干．因此，Ｄ对于提干没有支持作用．