44. A significant contribution of intestinal bacteria to human nutrition is the benefit of bacterial_________.
(A) production of vitamins A and C
(B) absorption of organic materials
(C) production of vitamin K
(D) recovery of water from fecal matter
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統計: A(0), B(1), C(1), D(1), E(0) #3056707
統計: A(0), B(1), C(1), D(1), E(0) #3056707