400
The author’s argument that destroying bot-flies and mosquitoes would be a beneficial action is most weakened by all of the following except
A. parasites have an important role to play in the regulation of populations
B. the elimination of any species can have unpredictable effects on the balance of nature
C. the pests themselves are part of the food chain
D. these insects have been introduced to the area by human activities
E. elimination of these insects would require the use of insecticides that kill a wide range of insects
What is D
Explanation:
In “except” questions find the true statements first. In this case find four statements that weaken the idea that destroying pests is beneficial. That means finding statements that show that it is not a good idea to destroy the pests. Answers A, B, C, and E give reasons why destroying these insects might be a mistake. D, however, is the right answer because it suggests that eliminating these insects might not be wrong, since they are not even natural inhabitants of the area.