将5 mol·L-1盐酸10 mL稀释到200 mL，再取出5 mL，这5 mL溶液的物质的量浓度是（ ）
| A．0.05 mol·L-1 | B．0.25 mol·L-1 |
| C．0.1 mol·L-1 | D．0.5 mol·L-1 |
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 |