`81.`

`->` `B`

`-` DC: One of the most urgent environmental problems... is the shortage of clean water `->` nói về nguyên nhân làm nước sách

`82.`

`->` `D`

`-` DC: they are being destroyed by a large amount of industrial sewage which pour into the lake every day

`83.`

`->` `B`

`-` DC: Even though laws have been made, the governments do not have the power to enforce them

`84.` 

`->` `D`

`-` marine `=` aquatic: biển, thuộc về nước

`--------------------------`

`85.`

`->` `B`

`-` DC: The city was founded by the Dutch in `1624`

`86.`

`->` `C`

`-` DC: In `1664`, the English took over the city and renamed it New York

`87.`

`->` `C`

`-` DC: with the population of more than `7` million in the city and `19` million in the metropolitan region

`88.`

`->` `D`

`89.`

`->` `D`

`-` DC: The English took over the city and renamed it New York

`90.`

`->` `B`

`-` DC: New York is also the place where tourists can visit some world famous art galleries and museums

`color{pink}{#ebe}`