已知还原性：Cl—<Br—<Fe2+<I—<SO2，由此判断下列反应必然发生的是
①2Fe3++SO2+2H2O=2Fe2++SO
+4H+ ②I2+SO2+2H2O=4H++SO+2I—
③2Fe2++I2=2Fe3++2I— ④2Br—+4H++SO=SO2↑+Br2+2H2O
| A．①② | B．②③ | C．③④ | D．①④ |
The children loved their day trip, and they enjoyed the horse ride ______.
| A．most | B．more | C．less | D．little |
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 |