用电子秤进行称量时（）。
A.不能超出最大的称量范围
B.可以超出最大的称量范围
C.可以不调平电子秤称量
D.不显示时可拍打显示部分
参考答案：A
请根据表格的内容提示，写一篇题为SAVE EARTH, SAVE US的公益广告解说词。
注意：1. 词数：120词左右；
2．内容要涵盖上面所列的几条；
3．不能逐词翻译。
With the development of modern society, pollution caused by human activities is becoming a mere and more serious problem.
All the classes in this school _________ 60 students though they are of different ages。
A．are consisted of
B．consist of
C．is made upof
D．make up of
