设NA代表阿伏加德罗常数的值，下列说法正确的是
| A．1 mol Na2O2跟 H2O反应转移电子的数目为2NA |
| B．1 mol氯气跟NaOH反应转移电子的数目为NA |
| C．常温常压下，22.4 L氯气所含原子数为2NA |
| D．标准状况下，22.4 L蒸馏水所含分子数为NA |
All the dishes in this menu, ______ otherwise stated, will serve two to three people. 
| A．as | B．if | C．though | D．unless |
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 |