Seals【B1】______so many needs of the people who live in the Far North. The meat of the seal is a【B2】______source of food. Oil fro

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问题     Seals【B1】______so many needs of the people who live in the Far North. The meat of the seal is a【B2】______source of food. Oil from the blubber, or fat, becomes【B3】______. Seal oil, when set on a fire, maintains a steady flame. Sealskins are made into boots and other articles of clothing. The bones become【B4】______or tools.  No part of the animal goes to【B5】______.
    The number of seals【B6】______greatly in different parts of the arctic. Wherever there are strong ocean currents, resulting in broken【B7】______you will find an【B8】______of these animals.【B9】______.
    Arctic seal hunting has been an active industry since the early part of the nineteenth century.【B10】______.More than 500,000 animals are killed each year by hunters operating in the main sealing grounds.【B11】______.
【B2】

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答案principal

解析 principal:主要的、首要的。音同principle,极易小错。联系空格前后的词语.句意是海豹肉是 ______ 的食物来源。空格处需要形容词作定语,principle是名词,意思也无法与句子契合,因此能够排除。
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