影响唾液淀粉酶发挥作用的主要原因是（ ）
给下列图片选择合适的对话。
A. - Do you like singing? - No. I like dancing.
B. - What are they? - They're snakes.
C. - Would you like some meat? - No. I like fish.
D. - Do you like pigs? - Yes. They're lovely.
