Unit3 Is this your pencil?单元练习 一、单项选择（共 15 小题；共 15 分） 1. --- Is this your jacket?--- .A. Yes, it isB. Yes, it isn'tC. No, it isD. No, this isn't 2. --- the notebooks in the box?--- Yes, .A. Are; they areB. Is; it isC. Are; those areD. Is; that is 3. --- Are t...
