已知方程式2H2(g)+O2(g)=2H2O(l) △H1=–571.6KJ·mol-1，则关于方程式
2H2O(l) =2H2(g)+O2(g) △H2=？的说法正确的是 （ ）
| A．方程式中化学计量数表示分子数 |
| B．该反应△H2大于零 |
| C．该反应的△H2=-571.6kJ·mol-1 |
| D．该反应可表示36g水分解时的热效应 |
Progress______ so far very good and we are sure that the work will be finished on time.
| A．was | B．had been | C．has been | D．will be |
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 |