在密闭容器中进行反应：X2(g)＋3Y2(g) 
2Z(g)，其中X2、Y2、Z的起始浓度分别为0.1 mol·L－1、0.3 mol·L－1、0.2 mol·L－1，在一定条件下，当反应达到平衡时，各物质的浓度有可能是( )。
| A．c(Z)＝0.5 mol·L－1 | B．c(Y2)＝0.5 mol·L－1 |
| C．c(X2)＝0.2 mol·L－1 | D．c(Y2)＝0.6 mol·L－1 |
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C．teachers’ energy was saved | D．was saved teachers’ energy |
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