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❓ 문제 According to the passage, what is the primary role of a keystone species?

A. To be the most abundant species in an ecosystem
B. To exert a controlling influence on community structure despite low abundance
C. To provide essential abiotic modifications for all other species
D. To be the top predator in every food web

✅ 정답

To exert a controlling influence on community structure despite low abundance

TOEFL Reading Tips

Skim the questions first, underline keywords, then locate in the passage
Watch for paraphrasing; correct answers are often reworded
Infer vocabulary meaning from context, not just memory
Base inferences on the passage; avoid over-extrapolation
Manage time: about 18 minutes per passage

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