请教问题

gwd 2 4

The total market value of real estate in A(a name of a region)  has steadily declined over the past 4 years, this decline has meant that the overall figure on which the city's property tax is based the assessed value of that real estate- has aslo declined. More over, the percentage of assessed value that was paid as property taxes to the city dd not change during this period.

1 Money collected from property taxes provided most of A's revenue during past 4 years

2 The percentage of A's overall revenue that ws collected from property taxes did not change over the past 4 years

3 The total amount of revenue that A has collected from property taxes has declined over the past 4 years.

完全不会。

能帮我回答一下么？