承德市高中2023-2024学年第二学期期末考试(578B)英语x

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承德市高中2023-2024学年第二学期期末考试(578B)英语x试卷答案

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25. How did the author find out what the city's southwest side looked like in the past?A. By reading earlier reports. B. By interviewing local people.C. By watching past street views.D.By searching his memories.

This may be because more insects tend to live on organic land and spill over into neighbouring fields, causing conventional farmers there to increase pesticide use, according to Larsen. The effect appears strongest when neighbouring fields are within 2.5 kilometres of the organic “focal field”.
However, the researchers noted that the presence of organic farmland is linked to a reduction in pesticide use on neighbouring organic fields, with a 10% increase in the area of nearby organic cropland being related to a 3% decrease in total pesticide use on organic focal fields. This may be because the larger area of organic farmland allows for a bigger and more stable (稳定的) community of beneficial insects.
When organic agriculture makes up a high rate of farmland—perhaps 20% or more—net pesticide use decreases no matter where the organic fields are sited, say the researchers. But when small areas of organic farmland—like in Kern County, where about 5.5% of agricultural land is organic—evenly spread through the landscape, net pesticide use may in fact be higher than when no organic farming is present.
However, this impact can be softened by bunching up organic farmland. Larsen said, “It might be worth considering how to encourage the concentration of new organic fields to basically take full advantage of its pest control benefits and limit the costs of being organic to conventional growers.
12. What’s the influence of organic farmland on neighbouring conventional fields
A. A decrease in production. B. An increase in pesticide use.
C. A decrease in insect population. D. An increase in beneficial insects.