mention the historical factors that enabled country people to move to towns.

list all the benefits generated by the scientific progress in the last centuries.

explain why in 1800 so many people were still living in the countryside.

criticize peasants who no longer wanted to produce their own food.

describe in detail the invention of soap, medicine and sewerage.

costly investment in technology.

enormous technological advance.

extremely great gap in technology.

small-scale technological program.

unsuccessful attempt to develop technology.

Only 2.5 billion people lived in large cities fifty years ago.

Global population has increased enormously in the last half-century.

Throughout history poor cities have developed faster than rich ones.

The continuous impoverishment of the countryside led to scientific advances.

Thanks to modern medicine the poorest cities can grow as fast as the richest ones.

hope that rich cities will continue to grow quickly.

surprise that new urban centers are experiencing progress.

the awareness that modern urban centers cannot avoid growth.

a feeling that excessive urban growth may not be beneficial.

disappointment that only the newest cities are growing fast.

"This" (line 3) refers to "a town or city" (line 2).

"They" (line 20) refers to "factories" (line 20).

"it" (line 27) refers to "impoverishment" (line 26).

"they" (line 31) refers to "cities" (line 31).

"ones" (line 43) refers to "cities" (line 42).

Great inventions in the history of mankind.

How to live in cities without missing the countryside.

The role of technology in the evolution of homo sapiens.

The several advantages of living in large urban centers.

It may not be wise for modern man to abandon the countryside.