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  3. The tree people in the Lord of the Rings—the Ents—can get around by walking. But for real trees, it’s harder to uproot. Because

The tree people in the Lord of the Rings—the Ents—can get around by walking. But for real trees, it’s harder to uproot. Because

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问题     The tree people in the Lord of the Rings—the Ents—can get around by walking. But for real trees, it’s harder to uproot. Because they’re literally rooted into the ground, they are unable to leave and go【C1】______.
    When a tree first starts growing in a certain area, it’s likely that the【C2】______envelope—:the temperature, humidity, rainfall patterns and so on—suits it. Otherwise, it would be unable to grow from a seedling. But as it【C3】______, these conditions may change and the area around it may no longer be suitable for its【C4】______.
    When that happens, many trees like walnuts, oaks and pines, rely【C5】______on so-called "scatter hoarders," such as birds, to move their seeds to new localities. Many birds like to store food for the winter, which they【C6】______retrieve.
    When the birds forget to retrieve their food—and they do sometimes—a seedling has a chance to grow. The bird Clark’s nutcracker, for example, hides up to 100,000 seeds per year, up to 30 kilometers away from the seed source, and has a very close symbiotic(共生的)relationship with several pine species, most【C7】______the whitebark pine.
    As trees outgrow their ideal【C8】______in the face of climate change, these flying ecosystem engineers could be a big help in【C9】______trees. It’s a solution for us—getting birds to do the work is cheap and effective—and it could give【C10】______oaks and pines the option to truly "make like a tree and leave. "
A)ages I)legacy
B)breathing J)notably
C)climatic K)offspring
D)elsewhere L)replanting
E)exclusively M)subsequently
F)forever N)vulnerable
G)fruitful O)withdraws
H)habitats
【C6】
选项
答案M
解析 空格位于以which引导的定语从句中，此从句主语谓语俱全，据此判断可填入副词，作状语修饰谓语动词。本句意为“很多鸟喜欢为过冬储存食物，这些食物它们——会取用”。结合上下文分析，答案为M)subsequently“随后，后来”。备选项中，forever意为“永远”，由于储存的食物不能永远取用，故排除；notably意为“显著地，尤其”不符合语境，故排除。
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