A.S2-
B.I-
C.NH4+
D.Na+
答案:C
Kate is on my right and Lucy is on my left. I'm_____Kate and Lucy.[ ]
A. on
B. between
C. behind
D. in front of
合成蛋白质的基本单位是()。
A.CP
B.乳清蛋白
C.氨基酸
D.三磷酸腺苷