下面小编小编跟大家一起了解英语四级新闻听力知识分享，希望对大家的学习有所帮助。
　　一、听力练习
　　1.
　　A. Air pollution may affect every organ, cell in the body.
　　B. Air pollution may be effectively controlled.
　　C. Air pollution is caused by human activities.
　　D. Air pollution may also be caused by indoor activities.
　　2.
　　A. Brain attacks attributes to 24% of deaths worldwide
　　B. The reports add that air pollution weakens bones, so they break more easily.
　　C. Air pollution is a major contributor to lung disease.
　　D. The researchers found air pollution to be harmful to the aging brain.
　　二、听力文本
　　Many in the scientific community say that PM2.5 can affect every organ and every cell in our body. Researchers have found that PM2.5 can even pass through the barrier that protects our brains. The heart and blood system is also affected. The WHO reports that air pollution causes 24% of deaths from brain attacks called strokes. The UN agency adds that 25% of all heart disease is from air pollution. Scientists study the damage air pollution does to our bodies. They warn that air pollution affects many systems in the body and is a great risk to health. It is well-known that air pollution is a major contributor to lung disease, but this review also shows how it can damage most other organ systems of the body." The researchers also found air pollution to be "harmful to the aging brain." They reported that older adults with heavy exposure to air pollution performed poorly on tests of brain operations. They said this group showed an increased risk of dementia compared to adults with less exposure. The reports add that air pollution weakens bones, so they break more easily. Air pollution also ages our skin, hurts our eyes and interferes with sleep. It affects the kidneys. And the researchers said living near busy roadways might lead to liver disease.
　　Question 1: What’s the main idea of this news report?
　　Question 2: According to the news report, which of the following statements is not correct?
　　三、重点词汇
　　1. barrier: a long pole, fence, wall, or natural feature, such as a mountain or sea, that stops people from going somewhere 隔栏；屏障；障碍物
　　2. exposure: the fact of experiencing something or being affected by it because of being in a particular situation or place 接触；面临；遭受
　　3. dementia; a medical condition that affects especially old people, causing the memory and other mental abilities to gradually become worse, and leading to confused behaviour （尤指老年性）痴呆
　　4. interfere: to involve yourself in a situation when your involvement is not wanted or is not helpful 干涉，干预
　　四、背景知识
　　细颗粒物又称细粒、细颗粒、PM2.5。细颗粒物指环境空气中空气动力学当量直径小于等于 2.5 微米的颗粒物。它能较长时间悬浮于空气中，其在空气中含量浓度越高，就代表空气污染越严重。虽然PM2.5只是地球大气成分中含量很少的组分，但它对空气质量和能见度等有重要的影响。与较粗的大气颗粒物相比，PM2.5粒径小，面积大，活性强，易附带有毒、有害物质（例如，重金属、微生物等），且在大气中的停留时间长、输送距离远，因而对人体健康和大气环境质量的影响更大。
　　五、参考答案
　　Question 1: A
　　Question 2: A