A:exposed
B:threatened
C:constructed
D:conserved
若-1≤x≤1时,函数fx=ax+2a+1的值有正值也有负值,则a的取值范围是( )
- Alice, is this your dictionary?
- Let me see. Oh, no. ______ is in my school bag.
The Red Army soldiers had to fight ________ all kinds of difficulties in their fight ________ the people's freedom.