A：生物膜的融合和转化
B：离子通道的开放和关闭
C：ATP的合成和水解
D：信号分子与突触前膜上受体的识别和结合
根据上下文提示补全对话。
A: What's on the farm?
B: ____ ____ a lake and some trees.
A: Is the farm ____?
B: Yes, it's very big.
A: ____ ____ an elephant on the farm?
B: Yes, there is. It's very strong.
A: Is there a house?
B: No, there ____.
——Have you heard the song Stay Here Forever?——Yes. It sounds _______.
