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7. GWD28-Q7: In 1960’s studies of rats, scientists found that crowding increases the number of attacks among the animals significantly. But in recent experiments in which rhesus monkeys were placed in crowded conditions, although there was an increase in instances of “coping” behavior—such as submissive gestures and avoidance of dominant individuals—attacks did not become any more frequent. Therefore it is not likely that, for any species of monkey, crowding increases aggression as significantly as was seen in rats. Which of the following, if true, most strengthens the argument? A. All the observed forms of coping behavior can be found among rhesus monkeys living in uncrowded conditions. B. In the studies of rats, nondominant individuals were found to increasingly avoid dominant individuals when the animals were in crowded conditions. C. Rhesus monkeys respond with aggression to a wider range of stimuli than any other monkeys do. D. Some individual monkeys in the experiment were involved in significantly more attacks than the other monkeys were. E. Some of the coping behavior displayed by rhesus monkeys is similar to behavior rhesus monkeys use to bring to an end an attack that has begun. 请NN解释下，我选的A 19. GWD28-Q19: Plankton generally thrive in areas of the ocean with sufficient concentrations of certain nitrogen compounds near the surface, where plankton live. Nevertheless, some areas, though rich in these nitrogen compounds, have few plankton. These areas have particularly low concentrations of iron, and oceanographers hypothesize that this shortage of iron prevents plankton from thriving. However, an experimental release of iron compounds into one such area failed to produce a thriving plankton population, even though local iron concentrations increased immediately. Which of the following, if true, argues most strongly against concluding, on the basis of the information above, that the oceanographers’ hypothesis is false? A.Not all of the nitrogen compounds that are sometimes found in relatively high concentrations in the oceans are nutrients for plankton. B. Certain areas of the ocean support an abundance of plankton despite having particularly low concentrations of iron. C. The release of the iron compounds did not increase the supply of nitrogen compounds in the area. D. A few days after the iron compounds were released, ocean currents displaced the iron-rich water from the surface. E. The iron compounds released into the area occur naturally in areas of the ocean where plankton thrive. 想知道B为什么错。。。
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