阅读-绿皮EX9[44]

zhangwzhongUID: 3153453

请教一道阅读题，题目涉及的句子已经标出。我读不出答案的意思：这句话讨论的应该是昆虫授粉的部分啊，说的是不育表现与栖息地的关系吗~ 为什么选D呢？

Experiments show that insects can function as pollinators of cycads, rare, palmlike tropical plants. Furthermore, cycads removed from their native habitats—and therefore from insects native to those habitats—are usually infertile. Nevertheless, anecdotal reports of wind pollination in cycads cannot be ignored. The structure of cycads male cones is quite consistent with the wind dispersal of pollen, clouds of which are released from some of the larger cones. The male cone of Cycas circinalis, for example, sheds almost 100 cubic centimeters of pollen, most of which is probably dispersed by wind. Still, many male cycad cones are com- paratively small and thus produce far less pollen. Further- more, the structure of most female cycad cones seems incon- sistent with direct pollination by wind. Only in the Cycas genus are the females' ovules accessible to airborne pollen, since only in this genus are the ovules surrounded by a loose aggregation of megasporophylls rather than by a tight cone.
26. The evidence in favor of insect pollination of cycads presented in lines 2-4 would be more convincing if which of the following were also true?
(A) Only a small variety of cycad species can be successfully transplanted.
(B) Cycads can sometimes be pollinated by means other than wind or insects.
(C) Insects indigenous to regions to which cycads are transplanted sometimes feed on cycads.
(D) Winds in the areas to which cycads are usually transplanted are similar to winds in cycads' native habitats.
(E) The transplantation of cycads from one region to another usually involves the accidental removal and introduction of insects as well

枯岛UID: 3134675

文章说：cycard是由昆虫授粉的，cycard被移植去别的地区时，离开了原生的地区，即这种昆虫所在的地区，被移走的植物很难被授粉。
D说移植前后，新地区和旧地区的风基本是一样的，这就排除了授粉的另一个影响因素——风。风移植前后没有变化，cycard却变得infertile，进一步证明昆虫授粉的可能性。

zhangwzhongUID: 3153453

2# 枯岛 哇~ 醍醐灌顶！明白了！感谢感谢！