脂肪酸合成的每一步都需要CO2参加，所以脂肪酸分子中的碳都是来自CO2
查看答案
The little boy was so__________ in a picture book that he did not hear the bell.
A. absorbed
B. absorb
C. abzorb
动物体内的脂肪组织可以直接利用脂肪分解产生的甘油再合成脂肪
A. 对
B. 错
He has used his mobile phone for five years and wanted to replace it _____ a modern one.
A. in
B. out
C. up
D. with
只有乙酰辅酶A是脂肪酸降解的最终产物
A. 对
B. 错
微信支付 
支付宝支付