A newborn infant had trouble breathing at birth. The infant was 3 months premature. The physicians treated the infant with a solution, which was directly injected into the lungs. Within seconds, the infant responded with much improved breathing. A major component of this solution is which one of the following?

A healthy man is not _____ of his breathing.

【单选题】Which of the following is incorrect? A. Tidal breathing is alsocalled cheyne-stokes respiration. B. Cheyne-stokes respirationwaxes and wanes cyclically so that periods of deep breathing alternate withperiods of apnea (no breathing). . C. Intermittent breathing ischaracterized by unpredictable irregularity. Breaths may be shallow or deep,and stop for short periods. D. Intermittent breathing is less severe than the tidal breathing

During combat, the body may have fever, _______ (tired), coughing and difficulty breathing.

breathing rate 译成：

He took a long slow breath, inhalingdeeply. A: breathing in B: breathing out C: vomiting D: swallowing

r_____________ a. connected with breathing

They walked through the forest breathing the ________ of pines.

Relax ____ possible and keep breathing steadily

Sign(s) of respiratory arrest requiring artificial respiration is(are)（）. A: vomiting B: blue color and lack of breathing C: irregular breathing D: unconsciousne