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The passage suggests that a lack of modern sanitation would make which of the following most likely to occur? According to the
The passage suggests that a lack of modern sanitation would make which of the following most likely to occur? According to the
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2009-04-18
109
问题
The passage suggests that a lack of modern sanitation would make which of the following most likely to occur?
According to the passage, the outbreak of dengue hemorrhagic fever in the 1950’s occurred for which of the following reasons?
选项
A、The mosquito Aedes aegypti was newly introduced into Asia.
B、The mosquito Aedes aegypti became more numerous.
C、The mosquito Aedes albopictus became infected with the dengue virus.
D、Individuals who would normally acquire immunity to the dengue virus as infants were not infected until later in life.
E、More people began to visit and inhabit areas in which mosquitos live and breed.
答案
B
解析
The best answer is B. Lines 22-26 of the passage state that the dengue hemorrhagic fever outbreak occurred when Aedes aegypti began to proliferate as a result of ecological changes. Choice A is incorrect because the passage implies that the mosquito was already present in Asia in the 1950’s. Choice C can be eliminated because the 1950’s epidemic is attributed by the author to Aedes aegypti, not Aedes albopictus. Choices D and E suggest possibilityies mentioned in the passage as causes for epidemics of other diseases but not of dengue hemorrhagic fever.
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