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考査一般疑問句的答語。問句"Is that ... ？"的答語中用代詞it代替that，排除A項；一般疑問句的回答用Yes或No,排除D項;C項用了縮寫形式，也應排除。