Read and choose. 给下列问句选合适的答语。

( ) 1. What time is it?                      

(     ) 2. How's the weather today?                    

(     ) 3.What day is the first day of the week?                                  

(     ) 4. What's the date?                                          

(     ) 5. When is Spring Festival?                              

A. It's September fifth.

B. It's eight o'clock.

C. Sunday.

D. It's sunny.

E. It's in January or February.  

X.25协议包括的三个层次是（）

A.物理层、数据链路层和分组层

B.物理层、互连层和传输层

C.网络层、传输层和应用层

D.数据链路层、网络层和传输层