利用右图装置进行下列实验，不能得出相关实验现象的是
| 选项 |
① |
② |
③ |
④ |
| A |
浓盐酸 |
Na2SO3 |
BaCl2溶液 |
出现浑浊 |
| B |
稀盐酸 |
石灰石 |
饱和Na2CO3溶液 |
出现浑浊 |
| C |
浓氨水 |
生石灰 |
酚酞溶液 |
出现红色 |
| D |
醋酸 |
贝壳 |
澄清石灰水 |
先浑浊后澄清 |
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 |