List the six different small talk topics?
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How can you keep a conversation going with someone you just met?
How can you describe someone's age, who is 45?
下列哪种维生素是葡萄糖耐量因子的组成成分()
A. 维生素A
B. 维生素B2
C. 维生素PP
D. 维生素D
儿童生长发育迟缓、食欲减退或有异食癖,最可能缺乏()
A. 蛋白质和热能
B. 钙
C. 维生素D
D. 锌
E. 碘