下列说法正确的是
| A．在常温常压下，11.2LN2所含有的分子数为0.5NA |
| B．在标准状况下, 22.4 L CO和N2的混合物的物质的量为1mol |
| C．在标准状况下, 18g H2O的体积为22.4 L |
| D．1mol SO2的体积为22.4 L |
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 |