题干
Edward and William are brothers. There is uncommon similarity between two boys.
A：an ; 不填
B：an ; the
C：a ; 不填
D：a ; the
答案(点此获取答案解析）
B
Edward and William are brothers. There is uncommon similarity between two boys.
A：an ; 不填
B：an ; the
C：a ; 不填
D：a ; the
中的动物细胞，排列在赤道板上的染色体的形态和大小各不相同，细胞可能是( )