题目

Students are supposed to agree with the teacher when classes begin in China. (对画线部分提问)students supposed to when classes begin in China? 答案：【1】What【2】are【3】do人体细胞代谢的正常进行离不开内环境稳态的维持。下列叙述正确的是（ ）A.只要内环境维持稳态，人体就不会患各种疾病B.毛细血管周围组织液与血浆相互转化的量总是相等C.内环境的渗透压90%以上来源于Na+和Cl-D.内环境是各种生物细胞直接生活的环境