今天前程百利小编为大家分享的是托福听力新题材料-蠕虫的便车。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：
Nematode worms hitch rides inside the guts of slugs and other invertebrates, and emerge alive and well after exiting with the rest of the digestive track's products.
Why did the tiny nematode worm cross the road? Well, for all the usual reasons. But a more interesting question is “how did it make the crossing?” Turns out, it may have hitched a ride—inside a slug, or other invertebrate. That’s according to a study in the journal BMC Ecology.
Nematodes are about a millimeter long. They’re often found on decomposing fruits or rotting plants, where they feast on the resident bacteria. But when that food source is exhausted, how do these diminutive diners make their way to their next meal, which could be in a mulch pile a major trek of several yards away?
To find out, researchers hit the compost heap, and they collected some 600 slugs and 400 centipedes, spiders, beetles, flies and locusts. And they found that the innards of slugs, centipedes and woodlice are littered with live worms that the larger creepy crawlies accidentally ingested as they snacked.
But what becomes of these itinerant intestinal interlopers? To solve that mystery, the researchers exposed 79 slugs to more than a million nematodes that had been tagged with a fluorescent marker. And they saw that the worms not only survive a southbound trip through a slug’s guts, they emerge none the worse for where-they’ve-been when their ride takes a bathroom break.
Sure, a chugging slug isn’t exactly high-speed rail. But its bacteria-filled belly means that, for the nematode passengers, the dining car is always open.
疑难词汇：
Slugs蛞蝓
Invertebrate adj. 无脊椎的;无骨气的
n. 无脊椎动物;无骨气的人
nematode adj. 线虫类的n. 线虫，线虫类
millimeter n. [计量] 毫米
decomposing n. 分解;解曲v. 分解(decompose的ing形式)
rotting vt. 腐败，腐坏之(rot的现在分词形式);深蚀刻n. 沤麻
diminutive adj. 小的，小型的，微小的n. 爱称;指小词;身材极小的人
compost heap堆肥堆
centipedes 蜈蚣
locust 蝗虫
crawlies 小爬虫
ingested vt. 摄取;咽下;吸收;接待
itinerant adj. 巡回的;流动的n. 巡回者;行商
intestinal adj. 肠的
interloper n. 闯入者;(为私利)干涉他人事务者;无执照营业者
tagged adj. 标记的;示踪的;加标记的v. 附以签条(tag的过去分词)
chugging n. 引擎中燃料的间歇性燃烧;爆炸声(等于chuffing)v. 发出嘎嘎声(chug的ing形式)
长难句解析：
1. But when that food source is exhausted, how do these diminutive diners make their way to their next meal, which could be in a mulch pile a major trek of several yards away?
难句类型：
When引导的时间状语从句+how引导的疑问句+which引导的疑问句
难句拆分：
But when that food source is exhausted ，When引导的时间状语从句;how do these diminutive diners make their way to their next meal，how引导的疑问句;which could be in a mulch pile a major trek of several yards away? which引导的疑问句。
2. But its bacteria-filled belly means that, for the nematode passengers, the dining car is always open.
难句类型：
That引导的宾语从句+插入语
句子主干：
its bacteria-filled belly means that
难句拆分：
for the nematode passengers，插入语;But its bacteria-filled belly means that the dining car is always open，That引导的宾语从句，作mean的宾语。
文本结构特点：
本篇文章主要讲的是蠕虫会利用鼻涕虫作为自己的交通工具。蠕虫很容易存活，他们从一个食物来源移动到下一个食物来源。但这些蠕虫是否对鼻涕虫有危害还需要进一步的研究。
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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