—He asked
A:Why I am so happy today
B:What will I do for the weekend
C:Who did I play football with after school
D:if I could go to the movies wih him tonight.
细胞在0.25M蔗糖溶液中吸水达动态平衡时,如果将该细胞置于纯水中,细胞将会
公差不为零的等差数列第2,3,6项构成等比数列,则这三项的公比为( )
某历史兴趣小组在开展研究性学习时收集了亚历山大东征、丝绸之路、马可•波罗来华等素材,请你判断他们的研究主题是( )