Wind pollination does, of course, require a lot of pollen. Birch and hazel trees can produce 5.5 and 4 million grains per catkin, respectively. There are various adaptations to help as much of the pollen go as far as possible. Most deciduous wind-pollinated trees (which shed their leaves every fall) produce their pollen in the spring while the branches are bare of leaves to reduce the surrounding surfaces that "compete" with the stigmas (the part of the flower that receives the pollen) for pollen. Evergreen conifers, which do not shed their leaves, have less to gain from spring flowering, and, indeed, some flower in the autumn or winter. 8.According to paragraph 3, why do most deciduous wind-pollinated trees produce their pollen in the spring? A To avoid competing with evergreen conifers, which flower in the fall or winter B So that the leaves of the trees receiving the pollen will not prevent the pollen from reaching the trees stigmas C Because they do not have enough energy to produce new leaves and pollen at the same time D In order to take advantage of the windiest time of year 答案B 翻成:所以树的叶子接收花粉将不会防止花粉直接从树的花蕊而来 感觉还是跟原文的意思有落差 请问该怎麽解析答案B这个选项呢? --

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