水热法制备纳米颗粒Y（化合物）的反应为3Fe2++2S2O32－+O2+aOH－=Y+S4O62－+2H2O，下列说法中，不正确的是
| A．a = 4 | B．Y的化学式为Fe2O3 |
| C．S2O32－是还原剂 | D．每有1molO2参加反应，转移的电子总数为4mol |
Charles was alone at home, with_______ looking after him.
| A．someone | B．anyone | C．not one | D．no one |
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 |