——This is between you and me. ——I promise. I won't tell others ______you say I can.
A:unless
B:or
C:since
D:and
下面属于我们应该积极培养的学习习惯是( )
病毒区别与动物细胞、植物细胞的主要特征是( )
选出恰当的应答语( )