下列说法正确的是
| A．HCl和NaOH反应的中和热△H＝－57.3kJ/mol，则1mol H2SO4和1mol Ca（OH）2反应的中和热△H＝2×（－57.3）kJ/mol |
| B．CO（g）的燃烧热是283.0kJ/mol，则2CO2（g）= 2CO（g）＋O2（g）反应的△H＝+（2×283.0）kJ/mol |
| C．需要加热才能发生的反应一定是吸热反应 |
| D．1mol甲烷燃烧生成气态水和二氧化碳所放出的热量是甲烷的燃烧热 |
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 |