单选题 What is the normal pH range for arterial blood?
A. 7.00 to 7.49.
B. 7.35 to 7.45.
C. 7.50 to 7.60.
D. 7.55 to 7.65.

【正确答案】 B
【答案解析】A pH less than 7.35 is indicative of acidosis; a pH above 7.45 indicates alkalosis.