- B Let’s go through each choice:
Choice A Though there is a link between the foramen magnum and
bipedalism, nothing in the passage indicates that the foramen magnum was
necessary for bipedalism to evolve.
Choice B The author says, “They discovered that the foramen magnum
in all bipedal mammals was, on average, more forward-positioned than
in quadrupedal mammals.” The phrasing of this sentence implies that all
mammals have a foramen magnum.
Choice C The passage says, “Since Dart’s discovery of the ‘Taung Child,’
there has been speculation that a forward-shifted foramen magnum is
an indicator of bipedalism.” From this sentence, it may be tempting to
conclude that Dart was the first to present the theory, but such an inference
is not warranted by the information in the passage. - C To weaken the argument, we want to show that increasing subway fare by
40 percent won’t lead to the necessary increase in subway revenue. Choice C
does this by showing that, after the increase, people can just use the cheaper
buses instead of the more expensive subways.
Choice A is incorrect because the relatively fast expiration date means
that people wouldn’t be able to hoard tokens before the increase, thus
strengthening her plan.
Choice B is incorrect because the argument concerns all subway fares, not
express versus local.
Choice D is incorrect because it’s a fact that we need to increase subway
revenue by 40 percent. Whether a larger percentage of people aren’t taking
subways in the near future is irrelevant.
Choice E provides a reason for the crisis, but doesn’t address the logic of the
chairwoman’s proposal.
CHAPTER 2 ■ GRE DIAGNOSTIC TEST 6301-GRE-Test-2018_001-106.indd 63 12/05/17 11:38 am