下列关于沉淀溶解平衡的说法中不正确的是（ ）
| A．难溶电解质在溶液中存在沉淀溶解平衡，且是一种动态平衡 |
| B．Ksp只与难溶电解质的性质与温度有关，而与沉淀的量和溶液中离子的浓度无关 |
| C．Ksp反映了物质在水中的溶解能力，可直接根据Ksp的大小比较电解质在水中溶解能力的大小 |
| D．可通过Q和Ksp的相对大小，来判断沉淀溶解平衡的移动方向 |
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 |