下列说法中正确的是（ ）
| A．标准状况下，22．4L水中所含的分子数约为6．02×1023个 |
| B．1 mol Cl2参加反应转移电子数一定为2 NA |
C．标准状况下，aL氧气和氮气的混合物含有的分子数约为 ×6．02×1023个 |
| D．从1 L 0．5 mol/LNaCl溶液中取出100 mL,，剩余溶液中NaCl物质的量浓度为0．45mol/L |
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 |