Q17 in the nation of partoria large trucks currently

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------------------------------------------------------------------------------------------------------------ Q17: In the nation of Partoria, large trucks currently account for 6 percent of miles driven on Partoria’s roads but are involved in 12 percent of all highway fatalities. The very largest trucks—those with three trailers—had less than a third of the accident rate of single-and double-trailer trucks. Clearly, therefore, one way for Partoria to reduce highway deaths would be to require shippers to increase their use of triple-trailer trucks. Which of the following, if true, most seriously weakens the argument? A. Partorian trucking companies have so far used triple-trailer trucks on lightly traveled sections of major highways only. B. No matter what changes Partoria makes in the regulation of trucking, it will have to keep some smaller roads off-limits to all large trucks. C. Very few fatal collisions involving trucks in Partoria are collisions between two trucks. D. In Partoria, the safety record of the trucking industry as a whole has improved slightly over the past ten years. E. In Partoria, the maximum legal payload of a triple-trailer truck is less than three times the maximum legal payload of the largest of the single-trailer trucks. Answer: A ------------------------------------------------------------------------------------------------------------ Q 18: Which of the following most logically completes the passage? Concerned about financial well-being of its elderly citizens, the government of Runagiadecided two years ago to increase by 20 percent the government- provided pensionpaid to all Runagians over 65. Inflation in the intervening period has been negligible,and the increase has been duly received by all eligible
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Runagians. Nevertheless,many of them are no better off financially than they were before the increase, in large part because ________. ------------------------------------------------------------------------------------------------------------ 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?
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