选出句中错误并改正。 ( ) 1. Is it a new book? No, it not is . _________________ A B C D ( ) 2. Are you a student and a teacher ? _________________ A B C D ( ) 3. She is reading a book, isn't her ? _________________ A B C D ( ) 4. How many water is there in the cup? _________________ A B C D ( ) 5. Which is your sister doing ? She is reading . _________________ A B C D