给问句选择合适的答句。
( )1. How long is the river? A. No, it isn't.
( )2. How old is the museum? B. It's about six thousand kilometres long.
( )3. Is it in our city? C. I went to the library.
( )4. Did you go swimming? D. Yes, I did.
( )5. Where did you go last Sunday? E. It's about 200 years old.