下列有关物质分离的实验：①用渗析法分离蛋白质和葡萄糖的混合液 ②用盐析法分离油脂皂化反应的产物 ③用升华法分离碘和砂子的混合物 ④用分液法分离已烷和水的混合物 ⑤用结晶法分离硝酸钾和氯化钠的混合物 ⑥用蒸馏法分离酒精与苯酚钠的混合物。你认为（ ）
| A．只有①不正确 | B．②④⑥不正确 |
| C．只有③⑤⑥正确 | D．全部正确 |
They use computers to keep the traffic _______ smoothly.
| A．being run | B．run | C．to run | D．running |
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 |