The passage is primarily concerned with discussing______ [br] The passage sugges

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问题 The passage is primarily concerned with discussing______ [br] The passage suggests that Toomre’s work complements Larson’s theory because it______

选项 A、specifies more precisely the time frame proposed by Larson
B、subtly alters Larson’s theory to make it more plausible
C、supplements Larson’s hypothesis with direct astronomical observations
D、provides theoretical support for the ideas suggested by Larson
E、expands Larson’s theory to make it more widely applicable

答案 D

解析 The best answer is D. Larson’s theory holds that numbrous gas clouds “drifted about, collided, lost orbital energy, and finally collapsed into a centrally condensed elliptical system” (lines 33-35). Toomre’s computer modeling apparently indicates a way in which this process could have occurred. The computer medeling thus provides theoretical support for Larson’s theory. Nothing in the passage suggests that Toomre’s computer modeling does any of the things mentioned in the other choices.

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