本广播主要讲的是因为淘金热，热带雨林付出的代价。虽然淘金热给人们带来了财富，但是人们采伐森林，破坏森林，最终破坏了热带雨林的生态系统。下面前程百利小编带大家一块看一下这篇托福听力背景材料中出现的生词和疑难句，正在备考托福听力的同学可以参考一下。
There’s a gold rush going on—and it’s affecting tropical ecosystems. The rush is due in part to an increase in wealth in developing countries and their subsequent acquisition of gold. Another factor is the loss of faith in financial markets since the financial crash, which prompts investors to put money into gold. The desire for gold made its price soar from $250 dollars per ounce in 2000 to $1,300 per ounce in 2013.
To determine the impact of increased gold mining prompted by the value jump, researchers evaluated about 1,600 gold-mining sites in forested areas and tracked the changes in forest cover between 2001 and 2013. They found an increase in deforestation of about 1,600 square kilometers. Deforestation picked up between 2007 to 2013—that parallels the financial crisis and the rise in the price of gold. In some areas, deforestation occurred four times as much in those latter six years as in the first six.
The study was published in the journal Environmental Research Letters. [Nora L Alvarez-Berríos and T. Mitchell Aide, Global demand for gold is another threat for tropical forests]
In addition to the destruction of the forest itself, mining causes additional problems, such as air, soil and water pollution from arsenic, cyanide and mercury. It also takes longer for forests to recover from mining than from other uses, such as agriculture. Another casualty of the global financial crisis.
疑难词汇：
subsequent acquisition 随后的收购
deforestation n. 采伐森林;森林开伐
arsenic n. 砷;砒霜;三氧化二砷adj. 砷的;含砷的
cyanide n. [无化] 氰化物
mercury. [天]水星温度表精神，元气
长难句解析：
1. Another factor is the loss of faith in financial markets since the financial crash, which prompts investors to put money into gold.
难句类型;
Which引导的非限制性定语从句
句子主干:
Another factor is the loss of faith
难句拆分：
Which引导的非限制性定语从句修饰the financial crash
好了，以上就是前程百利小编为大家整理的托福听力背景材料中学单词+疑难句之淘金热的代价的内容，希望在备考的路上助大家一臂之力。最后，小编祝大家在托福考试中取得好成绩！
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