单选题 A 7-year-old boy is hospitalized with cystic fibrosis. To help him manage secretions and avoid respiratory distress, the nurse should
A. perform chest physiotherapy every 4 hours.
B. give pancreatic enzymes as ordered.
C. place the child in an oxygen tent and have oxygen administered continuously.
D. serve a high-calorie diet.

【正确答案】 A

【答案解析】Chest physiotherapy aids in loosening secretions in the entire respiratory tract. Pancreatic enzymes aid in the absorption of necessary nutrients--not in managing secretions. Oxygen therapy doesn't aid in loosening secretions and can cause carbon dioxide retention and respiratory distress in children with cystic fibrosis. A high-calorie diet is appropriate but doesn't facilitate respiratory effort.