看图,对划线部分提问。 1. Yao Ming is writing a letter. _________is Yao Ming _________? 2. Yao Ming's stamp is one y uan . _______ _______ is Yao Ming's stamp? 3. Yao Ming needs eight postcards. ________ ________ postcards does Yao Ming need? 4. Yao Ming is sending the letter to America . _________ is Yao Ming sending the letter?