TOEFL Reading: ETS-TOEFL阅读机经 - 5W1GTE6LH1QV5N21L$

According to paragraph 4, why did the South African bronze butterfly become a major pest in Spain? A. Spain has a greater number of flowers for the butterflies to feed on B. The butterfly's larvae reach maturity more quickly in Spain than they do elsewhere. C. There are no natural predators of bronze butterfly larvae in Spain D. The species of geranium that is found in Spain is a more delicate garden plant and easier for pests to consume