The population of cities in developing nations is getting smaller.（)

Air pollution People and air pollution are often in the same places. This means that cities with large populations have the biggest problem of dirty air. Air pollution is caused by many different thi

根据下面材料，回答题。 Development in Newspaper OrganizationOne of the most important deve

Brooklyn, New York, had a population of about 23,000 when it becomes a city in 1834.

______is the largest populous city in Australia.A．MelbourneB．PerthC．DarwinD．Sydney

Population experts tell us that by the year 2025, the population in cities in developi

In Australia, ______ is the most populated city.A．SydneyB．MelbourneC．CanberraD．Newcastle