某兴趣小组为了分析电解硝酸溶液时放电的离子，设计了如图装置进行实验（石墨电极）。电解过程中，X极产生了红棕色气体，则下列说法不合理的是
| A．a极为负极，b极为正极 |
| B．电解时，Y极附近溶液pH降低 |
| C．相同条件下，阴阳两极气体体积比是2:1 |
| D．X极的电极反应式是：2H＋+ NO3－+ e－=NO2↑ + H2O |
It’s high time you had your hair cut ; it’s getting _______ . 
| A．too much long | B．much too long |
C．long too much | D．too long much |
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 |