看图完成对话。

A: Hello, nice to see you.

B: Nice to see you, 1.          . What 2.           is it today?

A: It's 3._____.

B: 4.           lessons do you have in the morning?              

A: I have four.                                                                 Monday

B: 5.           they?

A: Chinese, Maths, English 6._____ Social Science.

B: Of the four subjects, 7.            do you like best?

A: I like Maths. It's very 8._____.

B: 9.           432 minus 234? Can you tell 10._____ at once?

A: Sure. It's 198. Right ?

B: You're so clever (聪明的).

下列选项中，属于供热管网形式的有( )。

A．区域式和统一式

B．蒸汽管网和热水管网

C．枝状管网和环状管网

D．冷水管网、热水管网和混合式管网

E．放射式和多回线式