常温下，下列有关溶液的叙述正确的是
| A．将pH=1的醋酸和pH=13的Na OH溶液混合后，若c(CH3COO－)=c(Na+)，则溶液显中性 |
| B．在Na2SO3溶液中：c(Na+) = 2c(SO32－ ) + c(HSO3－) + c(OH－ ) |
| C．pH=6的CH3COOH溶液和pH=6的NH4Cl溶液，由水电离出的c(H+)均为1×10－8mol·L－1 |
| D．在饱和Na2CO3溶液中：2c(Na+) = c(CO32－) + c(HCO3－) + c(H2CO3) |
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 |
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 |