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Bears ______ fat stores throughout the summer and fall to have energy enough to last them through winter sleep.
A.build upB.pack upC.bring upD.take up
A

试题分析:句意:黑熊在夏天积累储存脂肪,开始有足够的能量去维持他们的冬眠。A积聚,加强,增多;B收拾行李;C抚养,呕吐;D.开始从事,占(时间,空间)。根据句意可知黑熊为了过冬要增加自己的脂肪,选A。
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