TOEFL Reading: ETS-TOEFL阅读机经 - 308377K99J5F7JV8L$

Paragraph 1 supports which of the following as the reason animals are a safer bet than wind as pollinators when the individual trees of a species are widely separated? A. Animals tend to carry pollen from a given flower further than the wind does. B. Animals serve as pollinators even where there is little wind to disperse the pollen. C. An animal that visits a flower is likely to deliberately visit other flowers of the same species and pollinate them. D. Birds and insects fly in all directions, not just the direction the wind is blowing at a given moment.