Hi Duongthang,
I am non native speaker, it seems the GMAT does not test your english ability, there are many words that even the native speakers don't understand, actually these words are there just to distract you, you should focus more on the structure and try to get the big picture.

Hello C I am also non native english speaker, and I am quite sure that Norwegian are better than us in English, however I don't think improving the seep reading will help you to master the RC because this type of passage need more a good understanding of the structure, tone and the main point than t...

I was hesitating between E and A but finally my answer is A, because the argument assumes that the presence of bird is a good indicators of the good air quality, but based on the stimulus, we can't assume that the local industry was the only cause to the air-pollution problems.

I hope it helps.

Hello, Interesting resources, thank you, I am going to start practice them, however these AWA topics date from 2006, so I was wondering if there is not a more recent version.

Hello Dre900

I find this in the web, you can use it with OG11

Liferocks, You are right.

Hello Hoffman I think if you have a great GMAT score such as 750, it might counterbalance your TOEFL Score, which is already great and shows a good command of English. However If I were you, I would retake the TOEFL. I am sure you can do better and your 2nd attempt and I do not think rescore will ch...

My answer is E by finding counter example.
Try for x= -6 and for y= 3