gre考试阅读真题解析(B)_GRE阅读

　　 Such an arrangement occurred in vascular plants as a whole.

　　 Such an arrangement could be shown to be beneficial to pollen release.

　　 The number of bracts could be shown to have increased over time.

　　 The airflow patterns over the cones surfaces could be shown to be produced by such arrangements.

　　27. Which of the following, if known, is likely to have been the kind of evidence used to support the view described in the first paragraph?

　　 Wind speeds need not be very low for wind-pollinated plants to fail to release pollen.

　　 The female reproductive organs of plants often have a sticky surface that allows them to trap airborne pollen systematically.

　　 Grasses, as well as conifers, generate specific aerodynamic environments within the immediate vicinity of their reproductive organs.

　　 Rain showers often wash airborne pollen out of the air before it ever reaches an appropriate plant.

　　 The density and size of an airborne pollen grain are of equal importance in determining whether that grain will be captured by a plant.

答案：17-27：CBABDCCDEAD

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