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    What Led to a Sharp Decrease in the Spread of Malaria
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What Led to a Sharp Decrease in the Spread of Malaria

Question 84

Question 84

Multiple Choice

What led to a sharp decrease in the spread of malaria? 


A)  the use of herbicides 
B)  the spraying of breeding areas with DDT and other pesticides 
C)  the creation of a vaccine 
D)  administering a solution of boiled water, salt, and sugar or rice

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