A. pollution causes health problems.
B. cities are always crowded.
C. it costs a lot of money to live in the big city.
D. crime is not a serious problem in big cities.
D
Dẫn chứng: Most importantly, there is always more crime in a big city, causing you second case your decision for living in a big city. You are much more likely to be a victim of a crime living in a big city than in a small town.
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