Thank you Papgust and TestLuv.

Thanks Testluv. My RC skills are weak. I take lots of time to read especially when the passages are long and complicated. Your method of skipping past the details and looking for author's point will help me. However, can you pls demonstrate this method will a small example may be with a passage with...

gmatmachoman , request you to post OA also when you post questions.
When the questions are tough, there will be numerous arguements between people and unless an expert steps in, we can't deduce whcih is correct one. hence posting questions which have OA will make sense.

The answers are CEB

The conclusion of arguement is "this method(the current method of extracting uranium from sea) of obtaining uranium is unlikely to be commercially viable." The reason is the cost of extracting uranium from seawater using the current method is higher than that of extracting from mines. NOw ...

(E) appears to be correct for the reasons explained above. but (a) is also attractive ans. While Brad's arguement involves only one aspect i.e. sale, he misses to consider the effect of renting videos which (a) brings out.

okigbo, please post the answer.

i feel that A is the answer. The author concludes that "Thus in ninety-nine out of a hundred alerts explosives will actually be present." i.e. in every 100 alerts 99 of them will actually be correct i.e. will be containing explosives i.e. 99% In the evidence, he is saying - if 100 bagage w...