Question

4.   ―Is that a baseball?

  --                                          

 

A. Yes, that is      B. No, it isn't

C. Yes, it's        D. It's a baseball

Answer 1

4.  B考査一般疑问句的答语。问句"Is that ... ？"的答语中用代词it代替that，排除A项；一般疑问句的回答用Yes或No,排除D项;C项用了縮写形式，也应排除。