Unit2 This is my sister.一、 单项选择 (15分)( ) 1. _ is my aunt, Mary.A. These B. This C. look D. I( ) 2. _ my cousins.A. These are B. This are C. These is D. This is( ) 3. His mothers _ is his grandmother.A. grandfather B. grandmother C. grandparents D. mother( ) 4. Is _ your brother?A. the boy B. a boy C. the girl D. a girl( ) 5. -Is Jeff _ brother? -Yes, he is.A. me B. you C. your D.