◎ 题干
Bears ________ fat stores throughout the summer and fall to have energy enough to last them through their winter sleep.                                
A.pack up B.build up
C.bring up D.take up
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Bears ________ fat stores throughout the summer and fall to have energy enough to last them through their winter sleep. (2013·浙江,17)A.pack upB.build upC.brin…”主要考查了你对  【序数词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。