[求助]OG-104还没解决的疑惑

Assumption is a required condition that has to be true. A-->B ==> -B-->-A. B is required condition. E does not have to be true in this case. E is related as it talks about tax credit and investment. I agree with you that R&D could be one type of investment (even though R&D is rarely capitalized as other investments).

The argument can be condensed as: "a" does not work and required condition is that "A" does not work, in which "A" is a large group that consists of "a". For example, Tom does not like his teacher. For this to be true, is it necessary that everyone in Tom's class dislikes the teacher? Apparently not.

In the question, it is not necessary for other tax credit not to work to reach the conclusion that this specific tax credit does not work. The fact could be that all other works while this alone does not work.

As you can see, E can be an asnwer for strengthen question.

茅塞顿开啊.  真的好兴奋看到你来回答我的问题!!

anyway, thank you!!

If the tax credit was ineffective, some other factors must determine the level

of spending, and could lead to much higher levels of spending in 1985 (against choice B), and

could render a higher level of tax credit ineffective (against choice C), but it could be that

credits are generally effective (against choice E).?????

有那位NN能帮忙解释一下OG的解释到底是什么意思?也太偷工减料了吧. " but" 在这里转折是什么意思? 是其它因素的影响导致的??

BTW, 对总教头的举例, 还不是特别明白, 用部分与整体的概念怎么来解释E错了呢? 虽然E没有D好,只是加强, 但 是不是对加强的选项取非, 也会消弱原文的结论?

The argument can be condensed as: "a" does not work and required condition is that "A" does not work, in which "A" is a large group that consists of "a". For example, Tom does not like his teacher. For this to be true, is it necessary that everyone in Tom's class dislikes the teacher? Apparently not.

谢谢