選出下列句子表述正確的一項。
( ) 1. A. Are they singing? Yes, they are.
B. Are they singing? Yes, they don't.
( ) 2. A. He is not crying now.
B. He not crying now.
( ) 3. A. What are they doing?
B. What they are doing?
( ) 4. A. What she is doing?
B. What is she doing?
( ) 5. A. Jack talking about his family.
B. Jack is talking about his family
