在有机合成中，常要将官能团消除或增加，且要求过程科学、简捷，下列相关过程不合理的是（ ）
A．乙烯→乙二醇：CH2==CH2  |
B．溴乙烷→乙醇：CH3CH2Br CH2==CH2CH3CH2OH |
| C．乙醛→乙烯：CH3CHOCH3CH2OHCH2==CH2 |
D．乙醇→乙酸：CH3CH2OH CH3CHOCH3COOH |
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 |
All the dishes in this menu, ______ otherwise stated, will serve two to three people. 
| A．as | B．if | C．though | D．unless |