GRE Reading Comprehension: ETS-GRE阅读ETS - 76E22WK5O8K3W9697

Which one of the following situations is most analogous to the history of global diversity summarized in highlighted sentence in the passage? A. The number of fish in a lake declines abruptly as a result of water pollution, then makes a slow comeback after cleanup efforts and the passage of ordinances against dumping. B. The concentration of chlorine in the water supply of large city fluctuates widely before stabilizing at a constant and safe level. C. An old-fashioned article of clothing goes in and out of style periodically as a result of features in fashion magazines and the popularity of certain period films. D. After valuable mineral deposits are discovered, the population of a geographic region booms then levels off and begins to decrease at a slow and steady pace. E. The variety of styles stocked by a shoe store increases rapidly after the store opens, holds constant for many months, and then gradually creeps upward.