【单选题】can be differentiated by a number of factors: the position of tongue in the mouth, the openness of the mouth, the shape of the lips, and the length of the vowels.
【单选题】The roof of the mouth, or the upper suce inside the mouth, is called
【判断题】该批货物的运费总额为26946.75元。
【单选题】The first paragraph mentions three ways of activating the saliva in the mouth.