For centuries, people have painted cities as unnatural...

Câu hỏi: Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks.
For centuries, people have painted cities as unnatural human conglomerations, blighted by pathologies such as public health crises, aggression and exorbitant costs of living. Why, then, do people throughout the world keep (26)_______ the countryside for the town? Recent research that is forming a multidisciplinary science of cities is beginning to (27)________ the answer: cities concentrate, accelerate, and diversify social and economic activity.
The numbers show that urban dwellers produce more inventions and (28)________ more opportunities for economic growth. Often large cities are also the greenest places on the planet because people living in denser habitats typically have smaller energy footprints, require less infrastructure and consume less of the world's resources per capita. _______ (29) with suburban or rural areas, cities do more with less. And the bigger cities get, the more productive and (30)_______ they tend to become.
The word or phrase which best fits the gap (27) is...
A. reveal
B. guess
C. unlock
D. look