It is a ________ lifestyle to eat a balanced diet and take enough exercise.

A. health           B. healthy       C. unhealthy       D healthily

　　《登高》被誉为“杜集七言律诗第一”“古今七言律诗之冠”。律诗每首____句____联，依次称为____、____、____、____。律诗要求____句必须押韵，____必须对仗。