求教Prep07一道CR

本来想用自己的话跟楼主解释，但是发现海外论坛上某人说得已经非常非常好了，copy过来一起学习
ok, one thing should be clear at the outset: you're trying to fill in a gap in the logic. (in fact, there's a literal gap to fill in!)

here's a diagram type thingy:
euro companies emerge
AND
euro companies take over euro market
AND
u.s. market emerges
AND
----
THEREFORE
u.s. companies will replace euro market sales with u.s. market sales

we currently have facts asserting that the u.s. firms will lose their hold on the euro market. however, we have nothing asserting that the u.s. firms will gain a hold on the u.s. market, the second half of the conclusion.

therefore, we need an assertion that says, or implies, that the u.s. firms will gain a hold in the u.s. market (i.e., the euro firms won't take over the u.s. market as well).

(a) irrelevant:
- recent increases are unrelated to maintaining production in the future
- recent increases in production have nothing to do with the main logic gap (ensuring that u.s. firms will have a hold on the u.s. market)

(b) irrelevant:
- this has nothing to do with anything related to the argument

(c) correct
this statement strongly suggests that the u.s. firms will dominate the u.s. market for the same reasons that the euro firms will dominate the euro market.

(d) doesn't help
- we know that the u.s. firms will lose the euro market anyway, so it doesn't matter whether that market grows or not

(e) WEAKENS the argument
- if the u.s. market is very small, then it's likely that the production/revenue/etc of u.s. firms will decline rather than stay constant.

--

as far as you query 'what is the best way to arrive at the correct answer': there's clearly not an extremely simple way, since gmac would not bother writing these questions if there were. the best way to figure out the underlying logic is to make a diagram (like the one i made above, with the ands and therefores), which will force you to map out the logic.


如果楼主也和我一样犹豫C和E，那么看这里

I dint like C.. because... C was more vague compared to E..


here's something to keep in mind when you do these.

if you're torn between two answers on Strengthen/Weaken, you should try to PICK THE ANSWER THAT'S MORE DIRECTLY RELATED TO THE SPECIFIC ELEMENTS OF THE PASSAGE'S LINE OF REASONING.

in this case, here are the "specific elements" i'm talking about:
this argument is designed to show that
* american manufacturers will still maintain domestic market share,
* even with the encroachment of the european manufacturers on the market.

the problem with the choice you selected is that it has nothing to do with the latter of these two factors. in addition, as mentioned in my post above, if the american market is very small to start with, then this factor works against the argument (even if that small market grows so that it's ... not so small).