GRE Big Book Critical Reasoning Test 24

GRE Critical Reasoning
Directions

Critical Reasoning questions test the ability to understand, analyze, and evaluate arguments. Some of the abilities tested by specific questions include identifying the roles played by specific phrases or sentences in an argument, recognizing the point of an argument, recognizing assumptions on which an argument is based" drawing conclusions and forming hypotheses, identifying methods of argumentation, evaluating arguments and counter-arguments, and analyzing evidence.

Each of the Critical Reasoning questions is based on a short argument, a set of statements, or a plan of action. For each question, select the best answer of the choices given.

 

In a recent study on the connection between brain abnormalities and violent behavior, the researcher examined more than three hundred people who had engaged in unusually violent behavior toward friends and family members. In most of the people studied, the researcher found clues of brain abnormalities, including evidence of past brain injury and physical abnormality. The researcher concluded that evidence of brain abnormalities could be used to predict violent behavior.

#1
Which of the following, if true, would most seriously weaken the researcher's conclusion?

Why can human beings outlast many faster four- legged animals when running long distances? Perhaps because early humans evolved as hunters on the hot African savannas. Humans developed the ability to release heat by sweating, but most mammals must pant, a function hard to regulate while running. Also, four-legged animals must adopt a pace that lets them breathe once in mid-stride; otherwise, the impact of the front legs hitting the ground will prevent deep inhalation. Humans can vary the number of breaths per stride, set a pace unsuited to the prey and so eventually exhaust it.

#2
The author's explanation of why human beings have evolved as superior distance runners would be most weakened if it were shown that

The government officials of a nation share its citizens’ understandings regarding the rules that governments are obligated to honor in their actions. Thus, when a nation deliberately ignores international law, the attitudes of even its government officials will become less favorable toward their government.

#3
Which of the following, if true, is the strongest relevant objection to the argument the teacher makes on the basis of the time yoga has endured?

The teacher of yoga said that he knows how good the yoga exercises feel and how beneficial they are to his mental and spiritual health. After all, he said, there must be something sound to any human practice that endures more than three thousand years of history.

#4
Which of the following could be an assumption on which the researchers relied in drawing their conclusion?

Researchers compared 42 average-weight and 47 obese infants, aged 7 to 9 months, with respect to current daily nutrient intake, ratio of formula or breast milk to solids in the diet, and maternal reliance on external feeding cues, such as time of day. Mothers completed a three-day food record at home before answering questions on current feeding practices. The researchers concluded from all of these data that, contrary to popular belief, the feeding practices of mothers of obese babies do not contribute significantly to their babies’ obesity.

#5
Which of the following could be an assumption on which the researchers relied in drawing their conclusion?

Ironically, people who use aspartame as a sweetener to reduce their caloric intake could wind up defeating their purpose, since studies show that high levels of aspartame may trigger a craving for carbohydrates by depleting the brain of a chemical that registers carbohydrate satiety.

#6
Which of the following conclusions can most properly be drawn if the statements above are true?

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