A: f(x)=1-x
B: f(x)=x
C: f(x)=0
D:f(x)=1
Each of us has _________ life goals, which will guide us to a bright future. Without life goals, we may waste our lifetime.
我是拼音小能手。
____
灯芯
耻辱
熄灯
汹涌