答案：B
题目分析：
解：
49b＋b=(49＋1)b
故选：B.
The biggest whale is _______ blue whale, which grows to be about 29 meters long-theheight of
_______ 9-story building. [ ]
A. the; the
B. a; a
C. the; a
D. a; the
《中华人民共和国循环经济促进法》规定，地方人民政府应当按照( )，合理布局废物回收网点和交易市场，支持废物回收企业和其他组织开展废物的收集、储存、运输及信息交流。
A．城乡规划
B．总体规划
C．专项规划
D．区域规划
biggest whale is _______ blue whale, which grows to be about 29 meters long-theheight of 