S（单斜）和S（正交）是硫的两种同素异形体。已知：
① S(单斜，s)＋O2(g) === SO2(g) △H1＝－297.16 kJ·mol-1
② S(正交，s)＋O2(g) === SO2(g) △H2＝－296.83 kJ·mol-1
③ S(单斜，s) === S(正交，s) △H3
下列说法正确的是
| A．△H3＝+0.33 kJ·mol-1 |
| B．单斜硫转化为正交硫的反应是吸热反应 |
| C．S（单斜，s）===S（正交，s）△H3＜0，正交硫比单斜硫稳定 |
| D．S（单斜，s）===S（正交，s） △H3＞0，单斜硫比正交硫稳定 |
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 |