【题目】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
在线课程【答案】A
【解析】
考查动词短语辨析。句意：黑熊在夏天储存脂肪，秋天有足够的能量去维持他们的冬眠。
A. build up积聚，加强，增多；B. pack up收拾行李；C. bring up抚养，呕吐；D. take up开始从事，占（时间，空间）。黑熊为了过冬要增加自己的脂肪，故选A。