A:adaptable
B:acceptable
C:advisable
D:available
They feel ____(内疚) about not being able to see their son often because they are busy with their work.
What color is the apple? It's ____.
关于如图所示国庆60周年大阅兵场景,下列说法错误的是( )
有关宇宙的理解,下列说法中正确的是()
已知log7log3log2x=0,那么x-12等于( )