TOEFL Reading: ETS-TOEFL阅读机经 - IT72IIND1S060XBHL$

Paragraph 2 supports the idea that nitrogen-fixing plant species are heavily represented in the early stages of a primary succession because they A. do not require soil that contains nitrogen. B. generally grow more rapidly than other plants. C. tend to be more stress tolerant than other plants. D. tend to be less weedy than other plants.