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Ancient Greece　　The Greeks were the greatest (great) sailors of their time.Greece has one excellent (41)_____ (nature) feature—the coastline.That’s why many Greeks left the mountains and (42)_____ (take) to the sea.
The ancient Greeks have (43)_____ (give) the world many ideas about life and how to live it.The idea of democracy (民主) started in Greece.So did many ideas of science, religion and (44)_____ (govern).But these ideas did not come out of Greece as a whole.Instead, they grew up in (45)_____ (differ) cities throughout the Greek Empire.
The cities of Greece grew up in valleys near the sea.Each city was (46)_____ (separate) from the others by mountains.The roads (47)_____ (connect) the cities were narrow and winding.Each city governed itself in its own way.And the (48)_____ (citizen) of each city were very proud of its way of life.In fact, each city was (49)_____ (real) an independent state.Such places are called city-states by (50)_____ (politics) scientists.