Q: What are they talking about?

A: They are expressing anger to someone.

B: They are expressing appreciation to someone.

C: They are asking someone to be different.

D: They are leaving because the coma makes the other one different.

解析：A

整段對話的意思是，我們?yōu)槟愀冻隽四敲炊?，你卻只說了一句回見，或許是你之前昏迷，才讓我們覺得你和其他人不一樣而已。因此整個對話是這兩位在向另外一位表達(dá)憤怒。A正確，B表達(dá)感謝不正確；CD不正確。

Monica: This is so typical. Y' know, we give, and we give, and we give. And then- we just get nothing back! And then one day, y' know, it's just, you wake up, and "See you around!" Let's go, Phoebe.
Phoebe: y' know what? We thought you were different. But I guess it was just the coma.

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