题目

To Please Your Friends, Tell Them What They Already Knew The research emeraged out of some real-life observations shared by Gilbert and co-authors Gus Cooney and Timothy D. Wilson：“Conversation is the most common of all human social activities, and doing it well requires that we know what our conversation partners most want to hear.___67___”says psychological scientist Daniel T, Gilbert of Harvard University. “When our friends try to tell us about movies we’ve never seen or albums we’ve never heard, we usually find ourselves bored, confused, and underwhelmed. ___68___. And 20．将 4mol A气体和 2mol B气体在 2L 固定体积的容器中混合并在一定条件下发生如下反应：2A（g）+B（g）?2C（g）．若经2s后测得C的浓度为 0.6mol•L-1，现有下列几种说法，其中正确的是（　　）A．用物质A表示的反应的平均速率为 0.6 mol•L-1•s-1B．用物质B表示的反应的平均速率为 0.6 mol•L-1•s-1C．2 s 时物质A的转化率为70%D．2 s 时物质B的浓度为 0.7 mol•L-1