`41` C 

`-` populated = crowed : đông người , đông dân cư

`42` B 

`-` Dẫn chứng : The five most populated cities today are Toky (35 million people) , Mexico City (1 million) , New Yok (`8,5 million),Bombay(18,3 million) and Sou Paulo(18,3 million)

`43` D 

`-` Dẫn chứng : By 2050 there will be 22 citities of that size 

`44` A

`-` Dẫn chứng : The United Nations's report concludes "The current population picture is on of dynamic population changes , reflected in a diverse patterns of childbearing , mortality migration , urbanization and ageing . 

`45` C 

`-` Dẫn chứng : The continuation and consequences of these population trend present opportunities as well as challenges for all societies in the twenty-first century 

`41.C`

`-`Từ "populated" ở trong bài có thể hiểu là đông đúc `->`crowded (Adj) : đông đúc

`42.B`

`=>`Dẫn chứng : The five most populated cities today are Tokyo (35 million people), Mexico City (1 million), New York (18.5 million), Bombay (18.3 million) and Sao Paulo (18.3 million). ( Câu 1 dòng 1 )

`43.D`

`=>`Dẫn chứng : By 2050 there will be 22 cities of that size. 

`44.A`

`=>`Dẫn chứng : The United Nations' report concludes, "The current population picture is on of dynamic population changes, reflected in new an4 diverse patterns of childbearing, mortality
migration, urbanization and ageing. 

`45.C`

`=>`Dẫn chứng : The continuation and consequences of these population trend present opportunities as well as challenges for all societies in the twenty-first century. ( Câu cuối của bài )