将下列句子改为选择疑问句。 1. The boy is tall. The boy is short. _____ the boy tall _____ _____? 2. He knows Mr. Wang. He knows Mr. Zhang. _____ he know _____ _____ _____ Mr. Zhang ? 3. He is old .He is young.. _____ he _____ _____ _____? 4. This is a cell phone. This is a telephone. _____ this a cell phone _____ _____ _____? 5. Is this a doctor? Is this a nurse? _____ this _____ _____ or _____ _____?