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《2018 GMAT官方指南》

《2018 GMAT官方指南》是GMAC（GMAT考试命题机构）中国大陆单家授权版本，是GMAT考试必备的专业辅导书。《2018 GMAT官方指南》系列总共有3本指南，其中包含15%的全新内容， 在《2018 GMAT官方指南》2018版中更新了130道全新真题，《GMAT文本逻辑推理 》2018版更新了45道全新真题，以及《GMAT定量推理》2018版更新了45道全新真题。

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664 In Colorado subalpine meadows, nonnative dandelions co-occur with a native flower, the larkspur. Bumblebees visit both species, creating the potential for interactions between the two species with respect to pollination. In a recent study, researchers selected 16 plots containing both species; all dandelions were removed from eight plots; the remaining eight control plots were left undisturbed. The control plots yielded significantly more larkspur seeds than the dandelion-free plots, leading the researchers to conclude that the presence of dandelions facilitates pollination (and hence seed production) in the native species by attracting more pollinators to the mixed plots.Which of the following, if true, most seriously undermines the researchers` reasoning?
665 An experiment was done in which human subjects recognize a pattern within a matrix of abstract designs and then select another design that completes that pattern. The results of the experiment were surprising. The lowest expenditure of energy in neurons in the brain was found in those subjects who performed most successfully in the experiments.Which of the following hypotheses best accounts for the findings of the experiment?
666 With seventeen casinos, Moneyland operates the most casinos in a certain state. Although intent on expanding, it was outmaneuvered by Apex Casinos in negotiations to acquire the Eldorado chain. To complete its acquisition of Eldorado, Apex must sell five casinos to comply with a state law forbidding any owner to operate more than one casino per county. Since Apex will still be left operating twenty casinos in the state, it will then have the most casinos in the state.Which of the following, if true, most seriously undermines the prediction?
667 It is widely assumed that people need to engage in intellectual activities such as solving crossword puzzles or mathematics problems in order to maintain mental sharpness as they age. In fact, however, simply talking to other people--that is, participating in social interaction, which engages many mental and perceptual skills--suffices. Evidence to this effect comes from a study showing that the more social contact people report, the better their mental skills.Which of the following, if true, most seriously weakens the force of the evidence cited?

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