A:雅典白昼最长,利于开展活动
B:惠灵顿与伦敦的白昼时间相等
C:正午太阳高度的大小决定了四城市熄灭电灯的顺序
D:当地日出时间最早的是莫斯科
Food is very important to our health. Everyone needs to eat well if he or she wants to have a strong body.Our minds, like our bodies, always need the best food. This kind of food is knowledge. We start getting knowledge when we are very young.
如图,这四位同学描述的可能是下面的哪一个化学符号( )