★ KS3-HIST-IND-0001正面
About five times
提示Work with an easy total: start with 100 people, then say what the same country looks like when it holds 200.
为什么Start with 100 people, 20 of them in towns. Fifty years later there are 200 people and 100 in towns: five times as many town dwellers, though the country itself has only doubled. That is why Manchester, Leeds and Bradford ran out of housing, clean water and sewers so quickly — the urban share and the total were climbing at once.
下次复习日期相同——「太简单」会让之后的间隔拉得更快
★ KS3-HIST-IND-0001背面