我又来问一道阅读题了。。来自吴中东阅读。

辛小九UID: 3384141

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 comparatively small and thus produce far less pollen. Furthermore, the structure of most female cycad cones seems inconsistent 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.
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27.        The passage suggests that which of the following is true of scientific investigations of cycad pollination?
(A) They have not yet produced any systematic evidence of wind pollination in cycads.
(B) They have so far confirmed anecdotal reports concerning the wind pollination of cycads.
(C) They have, until recently, produced little evidence in favor of insect pollination in cycads.
(D) They have primarily been carried out using cycads transplanted from their native habitats.
(E) They have usually concentrated on describing the physical characteristics of the cycad reproductive system.
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答案是A。
我很困惑的是，题目中出现了好多cycad的什么大小啊之类的叙述，为什么E选项不对呢？

跪谢各位！！

希望中的玫瑰UID: 2909568

这个passage中提到了两种pollinating cycads methods: 1. by insect; 2. by wind. 文章先提出insect 论；然后“nevertheless"转到wind 论也不能被忽视，之后的“structure of cycads...by wind."都是support wind论的evidence。之后Still.....到最后，又用the physical structure of female and male cycad来说质疑wind论。所以这样一来，答案很明显，就是A, wind pollination have not yet owned systematic evidence. D项本身没有错，但是这个只是作为解释scientific investigation of cycad pollination其中一种方法的论据，并不是整个scientific investigation的关键所在。
不知道，我这个解释你懂了没有。