判断下列英语句子中哪个是对的,并说原因.
1.A:doyouhaveanappetite?
B:doyouhaveappetite?
2.A:Animportantthingisabalancebetweenyourlunchanddinner.
B:Animportantthingisabalanceofyourlunchanddinner.
3.A:IgotacoldbecauseIsleptwithoutcoveringablanket.
B:IgotacoldbecauseIsleptwithoutcoveringmyselfwithablanket.