TOEFL Listening: TPO-TOEFL阅读TPO - 34S9N824B82P_63ON$

How is paragraph 2 related to paragraph 3? A. Paragraph 2 provides a general description of desert plants, and paragraph 3 provides a scientific explanation for these observations. B. Paragraph 2 divides desert plants into two categories, and paragraph 3 provides further information about one of these categories. C. Paragraph 2 proposes one way of dividing desert plants into categories, and paragraph 3 explains one problem with this method of classification. D. Paragraph 2 discusses two categories of desert plants, and paragraph 3 introduces a third category of plants.