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Science reporter: In an experiment, scientists fed one group of mice an ordinary diet and fed another group a diet fortified with the microbes found in yogurt. The mice then explored a maze made up of tunnels and uncovered paths. The mice on the fortified diet ventured out of the tunnels twice as often as the other mice did, suggesting that the mice on the fortified diet felt less anxiety about being out in the open. This shows that the differences in the mice's diets affected their anxiety levels. Which of the following, if true, would most strongly support the science reporter's conclusion? A. In addition to having the added microbes, the fortified diet differed from the ordinary diet by having significantly fewer calories. B. The microbes found in yogurt produce a chemical known to lower anxiety levels. C. In a second experiment conducted to check the results of the first, the diets of the two groups of mice were switched, and then the mice ran the maze again. D. Dietary changes can affect mice's sensitivity to light and thereby affect the strength of their preference for dark, enclosed spaces. E. The anxiety levels of mice affect their behavior in many ways that the scientists could have easily observed during the experiment.
Recent photographs of the planet Venus reveal long lines that appear to be the result of massive streams of lava from volcanic eruptions. However, the lines cannot have originated from lava flows, since some of these lines are over l,000 miles long, and recently acquired evidence shows that the surface temperature of Venus is not high enough to allow molten lava to travel much more than 200 miles before solidifying. For an evaluation of the argument, it would be most useful to determine whether A. craters formed by meteor impacts on Venus could have made some of the lines shorter than they originally were B. the photographs of Venus reveal some mountain peaks that could only have been formed by volcanic eruptions C. there still exist active volcanoes on Venus that could cause new lava flows to occur D. mountain ranges might have prevented lava flows from extending farther than they would have if they had not encountered such obstructions E. at the time the lines were formed, the surface of Venus was substantially closer to the temperature at which lava melts than it is now
参考答案：BE
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发表于 2021-11-3 18:01:38
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