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题目材料：

The author of the passage is primarily concerned with

A.discussing two categories of factors that control population growth and assessing their relative importance
B.describing how growth rates in natural populations fluctuate over time and explaining why these changes occur
C.proposing a hypothesis concerning population sizes and suggesting ways to test it
D.posing a fundamental question about environmental factors in population growth and presenting some currently accepted answers
E.refuting a commonly accepted theory about population density and offering a new alternative

A显示答案

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以上解析由考满分老师提供。