下列措施或事实不能用勒沙特列原理解释的是（ ）
| A．滴加酚酞的氨水中加入氯化铵固体后红色变浅 |
B．棕红色的NO2加压后颜色先变深后变浅（已知: 2NO2 (g)  N2O4 (g)） |
| C．工业上生产硫酸的过程中，使用过量的空气以提高SO2的利用率 |
| D．煅烧粉碎的硫铁矿利于SO2的生成 |
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 |