--- ____ at the new school?

--- Fine, I've got used to the life there and I've made some friends.

A．How are you

B．How are you doing

C．Are you getting on well

D．How do you do

DiffServ是Internet实现QoS的一种方式，它主要依靠___1___，其主要缺点是___2___。

1（）

A．RSVP和PATH

B．SLA和PHB

C．LSR和RTP

D．RESV和FEC