Question

     1. —Is this your number?

        -                                

A. Yes, this is     B. Yes, it is

C. No, this not    D. Yes, he is

Answer 1

 1. B考查一般疑问句的答语。Is this ...?是含有be动词的一般疑问句，其肯定回答为"Yes, it is.",否定回

答为"No， it isn't:故选B。