求解托福听力问题！TPO34-L3 Plants and Pollinators

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TPO34-L3 Plants and Pollinators
第五题:
According to the lecture, what can be inferred about a royal water lily whose flowers are red?

答案是: A. Its flowers have already been pollinated.
但是根据相关段介绍: When a beetle arrives at the flower, the flower closes around it for about 24 hours so that the beetle comes covered with pollen. Then when the flower opens, its color changes to red.
也就是, 这只beetle做的事是: 1. 从雄性花上 粘上花粉(1. 雄性-->花粉)，并不是 2. 花粉传播到雌性柱头(2. 花粉-->雌性柱头)的过程。

而pollination的定义(来自维基): transfer of pollen from a male part of a plant to a female part of a plant.=2. 花粉-->雌性柱头

所以，答案为什么选择A.?


还是我对pollination的理解过窄?
就算A正确，那D又为何不对?
D. Its flowers have just closed.


有没有小伙伴有同样的困惑的? 求解！