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[A] Pollen produced higher in the top branches is likely to go farther: it is windier (and gustier) and the pollen can be blown
[A] Pollen produced higher in the top branches is likely to go farther: it is windier (and gustier) and the pollen can be blown
admin
2022-04-28
59
问题
[A] Pollen produced higher in the top branches is likely to go farther: it is windier (and gustier) and the pollen can be blown farther before hitting the ground. [B] Moreover, dangling catkins like hazel hold the pollen in until the wind is strong enough to bend them, ensuring that pollen is only shed into the air when the wind is blowing hard. [C] Pollen is shed primarily when the air is dry to prevent too much sticking to wet surfaces or being knocked out of the air by rain. [D] Despite these adaptations, much of the pollen fails to leave the top branches, and only between 0.5 percent and 40 percent gets more than 100 meters away from the parent. But once this far, significant quantities can go a kilometer or more. Indeed, pollen can travel many thousands of kilometers at high altitudes. Since all this pollen is floating around in the air, it is no wonder that wind-pollinated trees are a major source of allergies.
Look at the four squares [■] that indicate where the following sentence could be added to the passage. Weather is also important.
Where would the sentence best fit?
选项
答案
C
解析
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