下列关系式中正确的是
| A．等体积等物质的量浓度的NaClO(aq)与NaCl(aq)中离子总数大小：N前＞N后 |
B．0.1 mol·L－1Na2S溶液中：2c(Na＋) c(S2－)＋c(HS－)＋c(H2S) |
| C．常温下将醋酸钠、盐酸两溶液混合后，溶液呈中性，则混合后溶液中： c(Na＋)＞c(Cl—)＞c(CH3COOH) |
| D．0.1 mol·L－1Na2CO3溶液与0.1 mol·L－1NaHCO3溶液等体积混合 |
c(CO32－)＋2c(OH－)c(HCO3－ )＋3c(H2CO3)＋2c(H＋)
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 |
I’m sure that your letter will get______ attention. They know you’re waiting for the reply. 
| A．continued | B．immediate | C．careful | D．general |
All the dishes in this menu, ______ otherwise stated, will serve two to three people. 
| A．as | B．if | C．though | D．unless |