今天前程百利小编为大家分享的是托福听力新题材料-农业知识。最近托福听力考试中出现了一些新题，那这些新题材料的来源是什么呢?大家都知道托福听力来源于学生的课堂内容和校园生活，所以小编特意为大家整理托福听力新题的材料来源，快来看一下吧!
原文：
Researchers suggest farmers should consider harvesting when fields are dry, to prevent dangerous bacteria blooms from contaminating food.
In 2011 a 28-state outbreak of Listeria from cantaloupes infected 147 people—and 33 of them died. After that, many Americans evidently thought twice about bringing one of the melons home—cantaloupe consumption dropped by half after the infections. But paying closer attention to the ecology of our fields—like tracking when they've been rained on—could be a step toward beating bacteria, and preventing that sort of food poisoning.
Researchers monitored spinach fields in New York State, both before and after irrigation and rain. And they found that levels of Listeria bacteria in the soil spiked in the 24 hours after water hit the field—up to 25 times the levels that were present a week after the rain.
The scientists cite two factors. Listeria is exceedingly common in the environment—from the soils of national parks to, yes, irrigation water. So Listeria could be getting dumped directly on fields during irrigation. But rain also creates more favorable conditions for a bacterial bloom—and that holds for any type of bacteria present in the soil, the researchers say—whether Salmonella, E. coli or the Listeria studied here.
The lesson for farmers, they say? Hold off on harvesting after rains or watering. And if you can't wait—consider rinsing the fruits or veggies after they come off the field. The researchers are developing a web app that'll help farmers forecast bacterial loads in their fields—to make sure that the only thing that makes it farm to table is your food, and not infections.
疑难词汇：
Contaminate vt. 污染，弄脏
Harvesting v. [农学] 收割;收获(harvest的ing形式)n. [农学] 收割;收获
adj. 收获的;收割的
cantaloupes甜瓜
evidently adv. 显然，明显地;清楚地
consumption n. 消费;消耗;肺痨
Hold off拖延;不接近;不使…接近
Web n. 网;卷筒纸;蹼;织物;圈套vt. 用网缠住;使中圈套vi. 形成网
长难句解析：
1. Researchers suggest farmers should consider harvesting when fields are dry, to prevent dangerous bacteria blooms from contaminating food.
难句类型：
省略that的宾语从句+to do引导的目的状语
难句拆分：
Researchers suggest farmers should consider harvesting when fields are dry ，省略that的宾语从句，作suggest的宾语;to prevent dangerous bacteria blooms from contaminating food，to do引导的目的状语从句。
2. But rain also creates more favorable conditions for a bacterial bloom—and that holds for any type of bacteria present in the soil, the researchers say—whether Salmonella, E. coli or the Listeria studied here.
难句类型：
Whether引导的宾语从句
句子主干：
rain creates conditions+ that holds bacteria
难句拆分：
rain also creates more favorable conditions for a bacterial bloom—and that holds for any type of bacteria present in the soil，and引导两个并列从句;the researchers say—whether Salmonella, E. coli or the Listeria studied here，whether引导的宾语从句，作say的宾语。
文本结构特点：
本篇文章主要讲的是经研究发现成熟的庄稼在灌溉之后或者被雨水淋之后会产生细菌，甚至会致命，所以建议农民：在庄稼成熟的时候，一定要赶在淋雨之前或者没有灌溉之前收获庄稼。
好了，以上就是前程百利小编为大家整理的备考托福听力背景材料以及专业词汇的学习。希望能在备考托福的路上助大家一臂之力。最后，小编预祝大家在托福考试中取得好成绩。
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