.

---Putting on a happy face not only helps us make friends but also makes us feel better.

--- ________.

A．I’d love to.

B．I’m with you on that.

C．It’s up to you .

D．It’s my pleasure.

重度烫伤深及（），皮肤会干硬、变白，甚至呈焦黑色，这时已感觉不到疼痛。

A、皮下组织

B、表皮

C、真皮

D、皮脂腺