Concision Doubt

By 1940, the pilot Jacqueline Cochran held seventeen official national and international speed records, and she earned them at a time when aviation was still so new for many of the planes she flew to be of dangerously experimental design. (A) and she earned them at a time when aviation was still so ...

Thanks GMAT Guru. great explanation.. it clears all my doubts how to solve such questions.. Thanks again

Hi Saransh, Heating-oil prices are expected to be higher this year than last year.. in this sentence Heating - oil prices of this year are compared with Heating -oil prices of last year. In the original sentence Heating -oil prices of the current year is compared with last year - wrong It should be...

I had a doubt over B. i think we need which before prohibits to make the relative clause parallel.
which was signed.. and which X,Y and Z.

Please clarify my doubts.

B looks like prohibits is the verb of Subject Nuclear Test

Hello sinsofgmat, As far as my understanding is concerned, Conclusion is : Scientist are threatened by smith work and are conspiring to discredit smith's work. So any options which tells us that scientist are in fact not conspiring and are not threatened by smith's work will be the correct answer. C...

Conclusion : experts need help

The number of North American children who are obese, that is who have more body fat than do 85 percent of North American children their age, is steadily increasing according to four major studies conducted over the past 15 years. If the finding reported above is correct, it can be properly concluded...

Trees Age : Strengthen

A tree's age can be determined by counting the annual growth rings in its trunk. Each ring represents one year, and the ring's thickness reveals the relative amount of rainfall that year. Archaeologists successfully used annual rings to determine the relative ages of ancient tombs at Pazyryk. Each t...

Confused : weakening the argument

No one who lacks knowledge of a subject is competent to pass judgment on that subject. Since political know-how is a matter, not of adhering to technical rules, but of insight and style learned through apprenticeship and experience, only seasoned politicians are competent to judge whether a particul...