下列哪种物质可防治癞皮病()
A．尼克酰胺
B．视黄醇
C．生物素
D．钴胺素
E．叶酸
参考答案：A
The shopping mall is making every effort to ________ new customers in order to sell more foods.
A．transfer
B．attract
C．stick
D．attack
重阳节的来历是什么？
