有机化学中取代反应范畴很广，下列有关CH3CH2OH的反应中（条件未注明）属于取代反应范畴的是 （ ）
①CH3CH2OH+HBr→CH3CH2Br+H2O ②2CH3CH2OH→CH3CH2OCH2CH3+H2O
③CH3CH2OH→CH2=CH2↑+H2O ④2CH3CH2OH+O2→2CH3CHO+2H2O
①②④ B．③ C．①② D．全是
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 |