A:ought to hel
B:must hel
C:must have helped
D:ought to have helped
评价一个城市的文明程度,不仅要看GDP的增长,更要看群众的满意程度。这一认识的哲学依据是( )
一对夫妇生育男孩时,形成受精卵的精子和卵细胞的染色体组成分别是( )