问题
选择题
Bears ______ fat stores throughout the summer and fall to have energy enough to last them through winter sleep.
A．build up
B．pack up
C．bring up
D．take up
答案
答案：A
题目分析:句意：黑熊在夏天积累储存脂肪，开始有足够的能量去维持他们的冬眠。A积聚，加强，增多；B收拾行李；C抚养，呕吐；D.开始从事，占（时间，空间）。根据句意可知黑熊为了过冬要增加自己的脂肪，选A。