简述维生素B12和叶酸缺乏的原因。
(1)摄入不足;(2)吸收障碍;(3)需要量增加;(4)药物的作用。
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Complete each of the following sentences with a (compound) word derived from the one(s) given in brackets.
Chicago has always been known as a city where ( )people could find good jobs. ( industry )
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