【题目】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
在线课程【答案】B
【解析】
试题分析：考查动词短语。句意：熊在整个夏秋季节储存脂肪，以获得足够的能量来度过冬天的冬眠。A。pack up打包；B.build up积聚，逐渐增加，锻炼身体；C.bring up提出，抚养；D.take up占据（时间、空间），从事；根据句意，故选B项。