A：原子最外层电子数为2的元素一定处于周期表ⅡA族
B：主族元素X、Y能形成XY2型化合物，则X与Y的原子序数之差可能为2或5
C：氯化氢的沸点比氟化氢的沸点高
D：同主族元素形成的氧化物的晶体类型均相同
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.
