下列各组物质中，等物质的量的两种有机物充分燃烧，消耗氧气的量相同是
| A．C3H4和C2H6 | B．C3H6和C4H8O | C．C3H6O2和C3H8O | D．C3H8O和C4H6O2 |
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 |