【单选题】
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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根据网考网移动考试中心的统计,该试题:
1%的考友选择了A选项
52%的考友选择了B选项
29%的考友选择了C选项
18%的考友选择了D选项