【简答题】A.Grocer. B.Taxicab driver. C.Carpenter. D.Shoe maker.
【简答题】It was clear that the small grocer was _____ people heowed money to. A. at the expense of B. at the risk of C. in the way of D. at the mercy of
【单选题】维生素D缺乏性佝偻病的预防工作下列哪种是错误的()
【单选题】Food alone is not the ______ of energy.