题目

正常人的体液pH都在一个相对稳定的范围内，否则人会生病。下列人体体液中，酸性最强的是 ( )A. 唾液(pH：6.6－7.1) B. 血浆(pH：7.35－7.45)C. 胆汁(pH：7.1－7.3) D. 胃液(pH：0.9－1.5) 答案：【答案】D【解析】当溶液的pH小于7时，呈酸性，且pH越小，酸性越强，胃液的pH最小，酸性最强。故选D。小动物在和谁打电话，问句答语选一选A. Yes, he is.B. Because it is playing with its friends.C. Yes, I do.D. Mary's.E. They are swimming in the river.【1】Do you like elephants? （____）【2】What are these ducks doing? （____）【3】Whose sweater is over there? （____）【4】Is he your maths teacher? （____）【5】Why is the rabbit jumping? （____）