常温下，某未知溶液中c(H＋)/c(OH－) ==1×1012，且含有大量Al3＋和NO
，检验此溶液中是否大量存在以下6种离子：①SiO
、②NH
、③Fe2＋、④Na＋、⑤HCO、⑥Cl－，其中不必检验就能加以否定的离子是( )
| A．①③⑤ | B．②③④ | C．①②⑥ | D．④⑤⑥ |
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 |