2017年大学四级英语考试听力辅导
饭可以一日不吃,觉可以一日不睡,书不可以一日不读。以下是小编为大家搜索整理的2017年大学四级英语考试听力辅导,希望能给大家带来帮助!想了解更多精彩内容请及时关注我们应届毕业生考试网!
More than 300 million people in Africa, Asia and Latin America are at risk of life-threatening diseases such as cholera and typhoid.
The reason: Pollution of water in rivers and lakes.
These are findings in a report from the United Nations Environment Program, also known as UNEP.
People search for scrap metal in polluted water at the bottom of one of the biggest trash dumps in the city, known as "The Mine," in Guatemala ses, bacteria and other microscopic organisms increased pollution in more than half of rivers across the three areas between 1990 and 2010, the report said. UNEP officials said long-lasting toxic pollutants like fertilizer or petrol increased during that period. Levels of salt rose in nearly one-third of the waterways.
The report listed population growth and expanding agriculture as two of the main reasons for the increase of surface water pollution. Another reason was an increased amount of untreated water containing waste products. In all, UNEP said, 323 million people were at risk of infection.
Dietrich Borchardt, the lead writer of the report, spoke to the Thomas Reuters Foundation. "The water quality problem at a global scale and the number of people affected by bad water quality are much more severe than we expected," he said.
But a large number of the rivers in the affected areas are still in good condition and need to be protected, Borchardt noted.
Disease-causing pollution was a problem in almost 25 percent of rivers in Latin America, the UNEP report said. Between 10 and 25 percent of the rivers in Africa were affected, as were up to 50 percent in Asia. Untreated sewage was the main cause of this, it said.
The report added that nearly 3.4 million people die each year from diseases or conditions like cholera, typhoid, polio and diarrhea. These are related to water quality.
UN officials believe as many as 164 million people in Africa are at risk of infection from the diseases. They said that 134 million people in Asia and 25 million in Latin America also are at risk.
The report said building more sewage systems was not enough to solve the problems of infection and deaths. It said the solution was for countries to treat their wastewater.
Organic pollution, such as sewage, can cause water to lose all oxygen. One of every seven kilometers of river in Latin America, Asia and Africa has no oxygen. This threatens freshwater fisheries, the report said.
Mines, homes and irrigation systems often release salty water in rivers and lakes, creating high salt levels there. Moderate to high salt levels affect one in three rivers across three continents, the report said.
Dietrich Borchardt called the increasing levels of water pollution over time "critical."
"It [costs] much more [money] to clean up surface water from severe pollution than to [start effective] management, which includes prevention of pollution," he said. "Tools are available but the [problem] is [getting people to use] them."
I'm Pete Musto.
Magdalena Mis reported on this story for the Reuters news service. Pete Musto adapted her story for VOA Learning English. George Grow was the editor.
We want to hear from you. How does your country deal with water pollution? Are there risks from other types of pollution in your country? Write to us in the Comments Section or on .
_____________________________________________________________
Words in This Story
toxic – adj. containing substances sickness or death by entering or touching the body
petrol – n. a liquid made from petroleum and used especially as a fuel for engines
sewage – n. waste material that is carried away from homes and other buildings in a system of pipes
irrigation – n. the supply of water used on something, such as land, by using pipes or other man-made equipment
-
2022大学英语四级听力技巧
大学英语四级考试,即CET-4,CollegeEnglishTestBand4的缩写,是由国家教育部高等教育司主持的全国性英语考试。考试的主要对象是根据教育大纲修完大学英语四级的在校专科生、本科生或研究生。下面是小编收集整理的2022大学英语四级听力技巧大学英语四级听力技巧1一...
-
创建绿色校园英语四级作文(精选13篇)
在学习、工作乃至生活中,大家都接触过作文吧,作文是一种言语活动,具有高度的综合性和创造性。一篇什么样的作文才能称之为优秀作文呢?以下是小编整理的创建绿色校园英语四级作文,供大家参考借鉴,希望可以帮助到有需要的朋友。创建绿色校园英语四级作文篇1Itisofgreat...
-
2017年大学英语四级模考试题阅读理解训练
Usuallynotrunhairhealthmeters,accountingforitishardtocarryononehundredmeterssprint.以下是小编为大家搜索整理2017年大学英语四级模考试题阅读理解训练,希望能给大家带来帮助!更多精彩内容请及时关注我们应届毕业生考试网!SectionBDirections:Inthissectio...
-
2023年英语六级听力备考建议
大学英语六级考试是由国家统一出题的,统一收费,统一组织考试,用来评定应试人英语能力的全国性的考试,每年各举行两次。下面是小编收集整理的2023年英语六级听力备考建议,希望对大家有帮助!英语六级听力备考建议1、加强听写的锻炼听写是提高听力的有效途径。建议找一...