在一定条件下，在2L的密闭容器中充入2molSO2和一定量的O2，发生反应2SO2(g)+O2(g)
2SO3(g)，进行到4min时，测得n(SO2)=0.4mol，若反应进行到2min时，容器中n(SO2)为
| A．1.6mol | B．1.2mol |
| C．大于1.6mol | D．小于1.2mol |
It is often ______ that human beings are naturally equipped to speak.
| A．said | B．to say | C．saying | D．being said |
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 |