生长素可促进肝产生哪种多肽物，对软骨生长有促进作用（）
A.促红细胞生成素
B.肾素
C.醛固酮
D.生长素介质
E.胆盐
参考答案：D
What is the best way you can imagine _____ the overuse of water in our school? [ ]
A. reducing
B. to reduce
C. reduced
D. reduce
简述干型脚气病的常见症状。
