【OG24-734题】One summer, floods covered low-lying garlic fields situated in a region with a large mosquito population. Since mosquitoes lay their eggs in standing water, flooded fields would normally attract mosquitoes, yet no mosquitoes were found in the fields. Diallyl sulfide, a major component of garlic, is known to repel several species of insects, including mosquitoes, so it is likely that diallyl sulfide from the garlic repelled the mosquitoes.Which of the following, if true, most strengthens the argument?_mofa留学圈mofaGRE在线题库系统_GRE在线搜题_GRE题库解析_GRE真题机经_GRE课程_GRE培训机构

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One summer, floods covered low-lying garlic fields situated in a region with a large mosquito population. Since mosquitoes lay their eggs in standing water, flooded fields would normally attract mosquitoes, yet no mosquitoes were found in the fields. Diallyl sulfide, a major component of garlic, is known to repel several species of insects, including mosquitoes, so it is likely that diallyl sulfide from the garlic repelled the mosquitoes.

Which of the following, if true, most strengthens the argument?

Diallyl sulfide is also found in onions but at concentrations lower than in garlic. The mosquito population of the region as a whole was significantly smaller during the year in which the flooding took place than it had been in previous years. By the end of the summer, most of the garlic plants in the flooded fields had been killed by waterborne fungi. Many insect species not repelled by diallyl sulfide were found in the flooded garlic fields throughout the summer. Mosquitoes are known to be susceptible to toxins in plants other than garlic, such as marigolds.

正确答案： D

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题干翻译
蚊子在静止水中产卵，被淹没的田地通常会吸引蚊子，但在这些田地里没有发现蚊子。二烯丙基硫醚是大蒜的主要成分，已知它能驱赶包括蚊子在内的几种昆虫，所以很可能是大蒜中的二烯丙基硫醚驱赶了蚊子。 逻辑链
Flooded fields, no mosquitoes → Diallyl sulfide repelled 问题类型
增强题 推理过程
论点是大蒜中的二烯丙基硫醚驱赶了蚊子，论据是被淹田地本应吸引蚊子却没有蚊子且二烯丙基硫醚能驱蚊。需要找能加强该因果关系的选项。 选项分析
A选项：二烯丙基硫醚在洋葱中的浓度比在大蒜中低。与大蒜中的二烯丙基硫醚是否驱赶了田地中的蚊子无关，排除。 B选项：洪水发生当年该地区整体蚊子数量比往年少很多。整体数量减少不能说明田地里没有蚊子就是因为二烯丙基硫醚，无法加强，排除。 C选项：到夏天结束时，被淹田地里的大多数大蒜植物已被水生真菌杀死。说的是大蒜植物的死亡情况，和二烯丙基硫醚驱赶蚊子没有直接联系，排除。 D选项：整个夏天在被淹的大蒜田地里发现了许多未被二烯丙基硫醚驱赶的昆虫物种。说明只有蚊子被驱赶了，进一步表明是二烯丙基硫醚的作用，加强了论点，当选。 E选项：蚊子已知对大蒜以外的植物（如万寿菊）中的毒素敏感。与大蒜中的二烯丙基硫醚是否驱赶了田地里的蚊子话题不一致，排除。

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