将W1g光亮的铜丝在空气中加热一段时间后迅速插入下列物质中，取出干燥。如此反复几次，最后取出铜丝，用蒸馏水洗涤、干燥，称其质量为W2g。实验时由于所插入的物质不同，铜丝前后质量变化可能不同。下列所插入物质与铜丝质量关系不正确的是
| A．石灰水W1<W2 | B．CO W1=W2 | C．硫酸溶液 W1>W2 | D．乙醇W1<W2 |
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 |