题目

如图为人体体液物质交换示意图，其中正确的叙述是（ ） ①A、B、C依次为血浆、细胞内液、组织液 ②乙酰胆碱可以存在于B中 ③D中的蛋白质的含量相对较低 ④正常情况下，ABC的化学成分和理化性质恒定不变．A．②③B．①④C．①③D．②④   答案：AThe fridge is __________ for one year. It means that the company that makes it promises to repair or replace it if it breaks down within a year. A. satisfied B. guaranteedC. recognized D. proved