gmatnub Thanks for advice. I didn't think that such a thing would be a problem for me in the tests. But when i began to work with Princeton guide i was confused. Here is the sample.
"Standardized tests are a tremendous burden on all prospective graduate students, but they are necessary control by which all candidates are judged equally." It's a quote from Princeton's guide.
Imagine you don't know the meaning of "tremendous burden" (i didn't know). So you have to guess the possible meanings. And you will find several meanings close to each other, but slight different. For example:
1. They are not fair because they don't show the real compitance of the concrete person.
2. They are too complex. (What is not the same to "tremendous burden", but only implies that statment).
etc.
That was an AWA task(or it could be CR question), and in that case such things begin to play a big role.