题目

What were you doing before you started reading this? Were you fully focused on another article? Or eating breakfast? Organizing your day? Or were you staring out of the window, feeling restless and bored?        It is likely to have been the latter. Brief moments of boredom are universal, and are frequently what drives us to stop what we are doing and move to something that we hope will be more exciting.        But although boredom is common, it is neither unimportant nor favorable, according to Dr John Eastwood, a psychologist at York University, Toronto. Eastwood is the j实验室用4molSO2与2 molO2进行下列反应：2SO2(g)+O2(g)2SO3(g)；△H=-196.64kJ/mol，当放出314.624kJ热量时，SO2的转化率为A．40%          B．50%          C．80%           D．90%