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 up | B．build up |
| C．bring up | D．take up |
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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 up | B．build up |
| C．bring up | D．take up |
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