Our boss is leaving on a trip and needs those papers __________.
A. urgent
B. urgently
C. urgented
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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
A. 对
B. 错
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
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