TOEFL Reading: ETS-TOEFL阅读机经 - 57W6XMY88Z19CBZ7L$

Directions: Ecological systems require the contributions of various species types. Complete the table by matching the appropriate species with their characteristics. This question is worth 3 points. A. They are large in number. B. Ecosystems form around them. C. They are more beautiful. D. They are smaller in number. E. Four carnivorous animals belong to them. F. They are more dangerous than anything else. G. Without them, ecosystems would collapse.