chrishalo801 chrishalo801

18-04-2017
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contestada

Which of the following helped to prevent cholera epidemics in the large industrialized cities?
A. the availability of vaccinations
B. an increase in the number of medical clinics
C. the construction of tenement housing
D. the chlorination of drinking water

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beccamitchem54 beccamitchem54

18-04-2017

c.................................

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