“--- Is this your notebook?  ---Yes, it is.” 朗读这组问答句的正确声调是_______.

A．--- Is this your↘notebook? ---↘Yes, ↗it is.

B．--- Is this your↘notebook? --- ↗Yes, ↘it is.

C．--- Is this your↗notebook? ---↘Yes, ↘it is.

D．--- Is this your↗notebook? --- ↗Yes, ↘it is.