我快要晕掉了!

因为A所以B在逻辑中不是表示成A->B吗?钱永强的<GRE逻辑分析>中说原因是结果成立的必要条件,不就是说结果->原因吗?到底怎么回事?

OG有道逻辑题:The pharmaceutical industry argues that because new drugs wil not be

developed unless heavy development costs can be recouped in later sales, the current 20 years of protection provided by patents should be extended ini the case of newly de

veloped in the case of newly developed drugs.However, in other industries new-product development coutinus despite high development costs ,a fact that indicates that the extension is unnecessary.

which of the following, if true, most strongly supports th pahrmaceutical industry's argument against the challenge made above?

答案是B Clinical trial of new drugs, which occur after the patent is granted and before the new drug can be marketed, often now take as long as 10 years to complete.

请高手指点一下,多谢!

版主:你在哪呢?

斑竹都睡觉去了

我对这题也有点晕