A. 维生素B1缺乏 B. 维生素B2缺乏 C. 维生素A缺乏 D. 维生素C缺乏 E. 维生素PP缺乏
A. and B. but C. or D. than
A. against B. for C. of D. through
A. pursued B. involved C. bargained D. avoided
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