A:铜片是负极
B:铜片质量逐渐减少
C:电流从锌片经导线流向铜片
D:氢离子在铜片表面被还原
If everyone ______to throw rubbish in the bins, our environment will become better and better.
____
人一生中身体发育和智力发展的黄金时期是( )