Since the 1930s aircraft manufacturers have tried to build airplanes with frictionless wings, shaped so smoothly and perfectly that the air passing over them would not become turbulent.

Which of the following best summarizes the "turning point" mentioned in line 2?

According to information presented in the passage, which of the following is a true statement about the methods of explanation used by biologists and historians in the nineteenth century?

Sartre, an inadvertent guru, had an opinion on everything, painfully considered, elaborately reasoned, often changed.

The primary purpose of the passage is to

When Medicare was enacted in 1965, it was aimed at the prevention of a catastrophic illness from financially destroying elderly patients.

Rejecting its argument that the Masters Dog Training Club’s primary aim was to teach people to train dogs, the court ruled the club ineligible for tax exemption as an educational group.

The passage is most relevant to which of the following areas of study?

It can be inferred that the idea of "an organic relationship between the self and the cosmos" (see lines 44–45) is necessary to the thinking of the five writers because such a relationship

To read of Abigail Adams’ lengthy separation from her family, her difficult travels, and her constant battles with illness is to feel intensely how harsh life was even for the so-called aristocracy of Revolutionary times.