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?