单项选择题

A.30cal/(kg·D.,20~40ml/(kg·D.
B.40cal/(kg·D.,40~60ml/(kg·D.
C.50cal/(kg·D.,60~80ml/(kg·D.
D.60cal/(kg·D.,90~100ml/(kg·D.
E.70cal/(kg·D.,100~120ml/(kg·D.