下列化学反应的离子方程式正确的是（ ）
A．金属铝溶于盐酸中：Al+2H+ Al3++H2↑ |
| B．向漂白粉溶液中通入SO2气体：Ca2++2ClO—+SO2+H2OCaSO3↓+2HClO |
| C．在标准状况下2.24LCO2通入1mol/L 100mLNaOH溶液中：CO2+OH－HCO3－ |
| D．碳酸镁溶于硝酸中：CO32－+2H+H2O+CO2↑ |
—— Do you mind my opening the window? It’s a bit hot in here.
—— ______ , as a matter of fact
| A．Go ahead | B．Yes, my pleasure |
C．Yes, I do | D．Come on |
It’s high time you had your hair cut ; it’s getting _______ . 
| A．too much long | B．much too long |
C．long too much | D．too long much |
My friend showed me round the town, ______ was very kind of him. 
| A．which | B．that | C．where | D．it |
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 |