单项选择题
A.30％～35％ B.40％～45％ C.50％～55％ D.60％～65％ E.70％～75％
A.70kcal/（kg·D. B.90kcal/（kg·D. C.110kcal/（kg·D. D.130kcal/（kg·D. E.150kcal/（kg·D.