单选题
14.
______at the outset, ______instead of shifting things about may be pheromones released when they reach committee size.
A、
The stimuli set them off. .. build collectively
B、
The stimuli that set them off. . . building collectively
C、
The stimuli setting them off. . . they build collectively
D、
Being set off by stimuli. .. their building collectively
【正确答案】
B
【答案解析】
stimuli是本题的主语，定语从句that set them off at the outset跟在其后，第二空格处应为分词短语building collectively作状语。由此可知本题答案为B。
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