——More and more students wear glasses in our school these days.——I agree with you. Students ___ keep on doing eye exercises to protect their eyes.
①一个染色体组中不含同源染色体
②一个染色体组中染色体大小形态一般不同
③人的一个染色体组中应含有24条染色体
④含有一个染色体组的细胞,一定是配子
实行“一国两制”科学构想的根本前提是( )