完成下列对话 1. A: What _______this? B: It is an apple. 2. A: How are you? B: ________. 3. A: Is it an orange? B: No, ________. 4. A: Look! ______________? B: It’s an apple. 5. A: Is it a bear? B: Yes, _____________. 6. A: I love you, mum! B: _____________.