下列反应制取乙醇，原子经济性最差的是( )
A．乙烯水化法：CH2=CH2+H2O CH3CH2OH |
| B．乙醛还原法：CH3CHO+H2CH3CH2OH |
| C．卤代烃水解法：CH3CH2Br+H2OCH3CH2OH+HBr |
| D．酯类水解法：CH3COOC2H5+H2OCH3COOH+C2H5OH |
—— Do you mind my opening the window? It’s a bit hot in here.
—— ______ , as a matter of fact
| A．Go ahead | B．Yes, my pleasure |
C．Yes, I do | D．Come on |
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 |