夏天，扇扇子为什么会感到凉快?

从下列各组句子中选出表达正确的一个句子

( )1. A. This are my sister.    

           B. This is my sisters.    

           C. This is my sister.    

           D. These is my sister

( )2. A. This isn’t me cousin.  

           B. This is me cousin.    

           C. This aren’t my cousin.    

           D. This isn’t my cousin

( )3. A. They is my brothers.    

           B. They are my brother.    

           C. They are my brothers.    

           D. These is my brothers

( )4. A. These is my mother.    

           B. This is my mother.     

           C. This is me mother.    

           D. This are my mother

( )5. A. Are this your grandmother?    

           B. Is these your grandmother?    

           C. Is these your grandfather?    

           D. Is this your grandfather?