把一定浓度的NaOH溶液分成两等份，一份密闭保存，另一份敞口放置，几天后用相同浓度的盐酸去中和它们，至溶液中只有NaCl时，若第一份用去盐酸V1mL，第二份用去盐酸V2 mL。则V1和V2的关系正确的是（ ）
| A．V1<V2 | B．V1=V2 | C．V1>V2 | D．不一定 |
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 |