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

試題分析:句意：黑熊在夏天積累儲存脂肪，開始有足夠的能量去維持他們的冬眠。A積聚，加強，增多；B收拾行李；C撫養(yǎng)，嘔吐；D.開始從事，占（時間，空間）。根據(jù)句意可知黑熊為了過冬要增加自己的脂肪，選A。
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