英语高手请进,小弟有事恳求 Do you think a dog is____________ than a cat?A

英语高手请进,小弟有事恳求
Do you think a dog is____________ than a cat?
A useful B more useful C most useful D much useful我想请问一下useful是不是双音节词?双音节词是不是读音有2个（包括2个以上）就是双音节词?
There are_______ special kinds of plants in the forest.They can eat insects or animals.
A a little B Because C Before D When
There are_______ special kinds of plants in the forest.They can eat insects or animals.
A a little B Because C Before D When 为什么 有追分
________the meal