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People are confused in their attempts to control malaria in Europe in the early 1900s, because scientists ______.

单选题
2022-01-03 13:33
A、identified only one mosquito species instead of six species
B、thought only three mosquito species transmitted disease
C、thought there was only one mosquito species
D、did not know what species was being studied
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正确答案
A
试题解析
解析：短文最后一段告诉我们，由于对蚊子种类不了解，20世纪初期疟病曾肆虐欧洲，最终，科学家才了解到坟子这一物种不是由一个种类而是由六个种类组成。所以应该选择A。
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