Old prep 中几道逻辑题 求指点

MarsTOF

Paint on a new airliner is usually applied in two stages:  first, a coat of primer, and then a top coat.  A new process requires no primer, but instead uses two layers of the same newly developed coating, with each layer of the new coating having the same thickness and weight as a traditional top coat.  Using the new process instead of the old process increases the price of a new aircraft considerably.

Which of the following, if true, most strongly indicates that it is in an airline's long-term economic interest to purchase new airliners painted using the new process rather than the old process?

(A) Although most new airliners are still painted using the old process, aircraft manufacturers now offer a purchaser of any new airliner the option of having it painted using the new process instead.
(B) A layer of primer on an airliner weighs more than a layer of the new coating would by an amount large enough to make a difference to that airliner's load-bearing capacity.
(C) A single layer of the new coating provides the aluminum skin of the airliner with less protection against corrosion than does a layer of primer of the usual thickness.
(D) Unlike the old process, the new process was originally invented for use on spacecraft, which are subject to extremes of temperature to which airliners are never exposed.
(E) Because the new coating has a viscosity similar to that of a traditional top coat, aircraft manufacturers can apply it using the same equipment as is used for a traditional top coat.


答案B  我选E

MarsTOF

http://forum.chasedream.com/GMAT_CR/thread-561975-1-1.html#last
另外一道疑问题。。

sdcar2010

This one is simple. Pay attention to the main conclusion:
Using the new process instead of the old process increases the price of a new aircraft considerably.

For a strengthener, you need to find a choice which helps explain how the airline can save or earn more money by using the new process.

B does just that since it shows that the total weight of the airplane could be lowered. Lower weight --> less fuel cost or more loads ($$).

E on the other hand, ONLY keep the new process as par with the old one without any propects of saving money.