锌粒与50mL稀硫酸反应，10分钟末时反应物均有剩余，收集到标准状况下224mLH2，反应前后溶液体积不变，此时间段内，反应的平均反应速率为
| A．v（Zn）=6.5g•min﹣1 | B．v（H2SO4）=0.05mol•L﹣1•min﹣1 |
| C．v（SO42﹣）=0.02mol•L﹣1•min﹣1 | D．v（H2）=22.4mL•min﹣1 |
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 |