从A、B、C、D四个选项中选出一个可以填入句中空白处的最佳答案。
( ) 1. —My son always goes to school without having ______ breakfast.
—It is ______ unhealthy habit. You must ask him to change it.
A. /; an B. /; a C. the; an D. the; a
( ) 2. —________is a boat ticket for children?
—How old is your child? It’s free for kids under three years old.
A. How long B. How much C. How often D. How soon
( ) 3. The libraries in your school are nicer than_______ in ours .
A. that B. ones C. those D. them
