老师对我们的成长扮演______,发挥______。
多种角色;多种作用
There is going to _____ an English party this evening in our school.[ ]
A. be
B. have
C. having
D. being
维生素B1缺乏()
A.夜盲症
B.脚气病
C.糙皮病
D.败血病
E.坏血病