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1. Which of the following best describes a pest?
A. any animal or plant which has a harmful effect on humans, their food or their living conditions
B. any animal or plant which has a useful effect on humans, their food or their living conditions.
C. any animal or plant which has a beneficial effect on humans, their food or their living conditions.
D. any animal or plant which has a positive effect on humans, ​their food or their living conditions.​