能正确表示下列反应的离子方程式为
| A．碳酸氢钠溶液中滴入氢氧化钙溶液：HCO3― + OH― ＝ CO32―＋ H2O |
| B．二氧化硫通入次氯酸钠溶液：SO2 + ClO― + 2OH―＝ SO42―＋Cl―＋H2O |
| C．硫化钡加入稀硫酸：BaS + 2H＋＝ H2S↑+ Ba2+ |
| D．硅酸钠溶液与醋酸溶液混合：SiO32－+2H＋＝H2SiO3↓ |
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 |