给下列的问句选出正确答语。 ( ) 1. Are these books yours or mine? ( ) 2. Is this a TV? ( ) 3. What is Danny doing? ( ) 4. Where is the toilet? ( ) 5. Do you see a lamp on the desk? A. It's in the bathroom. B. They are mine. C. No, I don't. D. Yes, it is. E. He is writing a letter.