下列说法正确的是
A． 的结构中含有酯基 |
| B．乙醇、乙酸、乙酸乙酯都可以与NaOH溶液反应 |
| C．1mol葡萄糖可水解生成2 mol乳酸（C3H6O3) |
| D．油脂和蛋白质都是能发生水解反应的高分子化合物 |
I can’t leave. She told me that I ______ stay here until she comes back.
| A．can | B．must | C．will | D．may |
—— 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 |