Theophylline ethylenediamide is administered to a client with COPD. The nurse knows that the medication is for which of the following purpose

A. To reduce bronchial secretions.
B. To relax bronchial smooth muscle.
C. To strengthen myocardial contractions.
D. To decrease alveolar elasticity.

排舞比赛的项目包括（）项目、单人项目和混合双人项目。