大全-A-18、大全-A-19 题目看不明白

At an enormous research cost, a leading chemical company has developed a manufacturing process for converting wood fibers into a plastic. According to the company, this new plastic can be used for, among other things, the hulls of small sailboats. But what does the company think sailboat hulls used to be made of? Surely the mania for high technology can scarcely go further than this.

18.   The author’s opinion of the manufacturing process described in the passage is based primarily on the fact that

(A) plastic is unlikely to be durable enough for high-quality sailboat hulls

(B) the research costs of developing the process outweigh any savings possible from the use of the plastic

(C) a small sailboat is not normally regarded as a high-tech product

(D) hulls for small sailboats can be made from wood without converting it into plastic（D）

(E) many other spheres of human activity are in far greater need of technological research

19.   Which of the following, if true, would most seriously weaken the author’s conclusion?

(A) The plastic produced by the process is considerably lighter, stronger, and more watertight than wood.

(B) The wood used in producing the plastic is itself in increasingly short supply.

(C) The cost of the manufacturing process of the plastic increases the cost of producing a sailboat hull by 10 to 15 percent.

(D) Much of the cost of the research that developed the new process will be written off for tax purposes by the chemical company.（A）

(E) The development of the new plastic is expected to help make the chemical company an important supplier of boat-building materials.

最后两句刚好是结论，看了n遍也没有明白。请指教。mania 癫狂

不会太弱智了吧？请大家路过不吝赐教呀

最后将题目贴全，理解要具体的SITUATION。

一个领先的化学公司花很多的研究资金，研究出将木材转换为塑料的生产方法，这家公司说这种新塑料在其他用途上，可作小航船的外壳。但是，这家公司以为小航船的外壳会是什麽做的（金做的吗，值得花这麽多资金去更换它，它不过是木材或铁做的，很便宜又好，当然不值得花这麽多资金研究新材料去替换它），对新技术的狂热确实莫过于此（没人比家公司更热衷新技术了，为了新技术花这麽多钱作不值得的事）

我将题目编辑过了，谢谢lawyer哥哥提醒。

我提供解题思路：

前提是：一个化学公司花了很多钱将船里的一个材料由木头转化为塑料，

结论；这种高技术没有必要，船的材料不是这个公司认为的那样（需要改进）

18题比较简单

19题二选一 A和E

A是直接削弱结论，plactic比wood的好

E它因削弱，plactic带来其他好处

A most weaken

But what does the company think sailboat hulls used to be made of? Surely the mania for high technology can scarcely go further than this. 但是，company对于从前用什么材料制造船壳有什么想法？显然，对高科技的狂热也不过如此。－原文对高科技表示了否定，结论是高科技没用，前提是以前的木头船壳也不比现在的塑料船壳差。

19A，指出plactic比wood好来说明高科技好，否定前提，否定结论；C做了无关比较，而且从某种意义上支持结论；D无关，核心词是cost，而原文的核心词是plactic

结论是作者认为这种高成本的创新没有必要，

但是a说明这种创新还是有一点价值的。

继续问

关键是这道题的要点是cost还是塑料本身？

我觉得他开头就强调了At an enormous research cost，原文意思是不是，花这么大cost仅仅研究船壳不合算，而不是说这种材料本身不好

18-b和19d为什么不对？

18-B和19-E为什么不对？

也是想到cost上面去了……

题目一开始说花了很多的研究资金，把木头变成塑料，用来做船壳，这是对科学太过于狂热了。

18答案是对木头本身能做船壳（研究无用），所以科学是狂热的。我的理解是花了太多的资金来做无用的研究是对科学的狂热。

19答案是塑料比木头好点，所以科学不完全狂热。我选E是因为塑料能比木头给company带来更多的好处，所以company的行为不是狂热的~

帮我看看怎样才能正确地揣摩到题目的思路上去呢？