治疗Wernicke脑病用（）
A.维生素A
B.维生素B1
C.维生素B2
D.维生素B12
E.维生素C
参考答案：B
We’ll plant trees tomorrow, and I don’t know Tom will come and join us.
A．if
B．which
C．what
D．where
机会性致病寄生虫opportunistic parasite
