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
网友回答
A. pack up
(答案→)B. build up
C. bring up
D. take up
解析：句意：熊在夏秋季节存储脂肪，保存足够的能量以度过冬眠。A 打包Ｂ逐步增加增强 Ｃ抚养 呕吐 Ｄ占据 举起 开始从事
【考点定位】考查动词短语辨析。