方程(x-y)2+(xy-1)2=0表示的曲线是( )
A:一条直线和一双曲线
B:两条直线
C:两个点
D:圆
A. She's my mother.
B. I have a happy family.
C. What's this?
D. This is my father.
Rose: ____
Tom: It's a picture (照片) of my family.
Rose: Who's this?
Tom: ____
Rose: Who's she?
Tom: ____ And this is me.
Rose: Are you happy?
Tom: Yes. ____
下列关于体温调节的叙述,正确的是( )