A. It's in front of the TV.
B. Thank you!
C. No, there aren't.
D. There is a ball and a big bed.
E. I can sing and dance
下列四种粒子的结构示意图中,表示金属元素原子的是( )
某同学近年来皮肤干燥,夜晚看东西眼涩,他应该补充( )