向淀粉中加入少量稀H2SO4，并加热。为了确定淀粉是否已水解或完全水解，所需下列试剂的组合正确的是（ ）
①NaOH溶液，②银氨溶液，③新制Cu(OH)2碱性悬浊液，④碘水，⑤BaCl2
| A．①⑤ | B．②④ | C．①③④ | D．②③④ |
My friend showed me round the town, ______ was very kind of him. 
| A．which | B．that | C．where | D．it |
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 |