在一定温度下，将CO和水蒸气分别为1 mol、3 mol，在密闭容器中反应： CO＋H2O(g)
CO2＋H2，达到平衡后测得CO2为0.75 mol，再通入6 mol水蒸气，达到新的平衡后，CO2和H2的物质的量之和可能为
| A．1.2 mol | B．1.5 mol | C．1.8 mol | D．2.5 mol |
They use computers to keep the traffic _______ smoothly.
| A．being run | B．run | C．to run | D．running |
If you leave the club, you will not be_____back in .
| A．received | B．admitted | C．turned | D．moved |
What I need is_____ book that contains ______ABC of oil painting.
| A．a; 不填 | B．the; 不填 | C．the; an | D．a ; the |
Jenny nearly missed the flight______ doing too much shopping.
| A．as a result of | B．on top of | C．in front of | D．in need of |
The CDs are on sale! Buy one and you get ______ completely free.
| A．other | B．others | C．one | D．ones ks |