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.
老的飞机涂层有两层，一层primer，一层coat。新的飞机没有primer，但是有两层同样的新的coat。和老的coat同样厚同样重。使用新的涂层增加了新飞机的价格。
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.
只是说新的涂层可以提供，并没有体现长期经济价值
(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.
正确，新老涂层不同对于飞机降落承受能力影响也不同，所以还是考虑用新的
(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.
说新的不如老的好，所以削弱使用新的
(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.
说新的对于飞机来说不适用，削弱使用新的
(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.
并没有体现新的长期经济效用。只是说可以通用 | 
