Recent research has claimed that an excess of positive ions in the air can have an ill effect on peoples physical or psychological health. What are positive ions? Well, the air is full of ions, electrically charged particles, and generally there is a rough balance between the positive and the negative charged. But sometimes this balance becomes disturbed and a larger proportion of positive ions are found. This happens naturally before thunderstorm, earthquakes when winds such as the Mistral, Hamsin or Sharav are blowing in certain countries. Or it can be caused by a build-up of static electricity indoors from carpets or clothing made of man-made fibres, or from TV sets, duplicators or computer display screens.
When a large number of positive ions are present in the air many people experience unpleasant effects such as headaches, fatigue, irritability, and some particularly sensitive people suffer nausea or even mental disturbance. Animals are also affected, particularly before earthquakes, snakes have been observed to come out of hibernation, rats to flee from their burrows, dogs howl and cats jump about unaccountably. This has led the US Geographical Survey to fund a network of volunteers to watch animals in an effort to foresee such disasters before they hit vulnerable areas such as California.
Conversely, when large numbers of negative ions are present, then people have a feeling of well-being. Natural conditions that produce these large amounts are near the sea, close to waterfalls or fountains, or in any place where water is sprayed, or forms a spray. This probably accounts for the beneficial effect of a holiday by the sea, or in the mountains with tumbling streams or waterfalls.
To increase the supply of negative ions indoors, some scientists recommend the use of ionisers: small portable machines, which generate negative ions. They claim that ionisers not only clean and refresh the air but also improve the health of people sensitive to excess positive ions. Of course, there are the detractors, other scientists, who dismiss such claims and are skeptical about negative/positive ion research. Therefore people can only make up their own minds by observing the effects on themselves, or on others, of a negative rich or poor environment. After all it is debatable whether depending on seismic readings to anticipate earthquakes is more effective than watching the cat.
1.What effect does exceeding positive ionization have on some people?
A.They think they are insane.
B.They feel rather bad-tempered and short-fussed.
C.They become violently sick.
D.They are too tired to do anything.
2.In accordance with the passage, static electricity can be caused by___.
A.using home-made electrical goods.
B.wearing clothes made of natural materials.
C.walking on artificial floor coverings.
D.copying TV programs on a computer.
3.A high negative ion count is likely to be found___.
A.near a pound with a water pump.
B.close to a slow-flowing river.
C.high in some barren mountains.
D.by a rotating water sprinkler.
4.What kind of machine can generate negative ions indoors?
A.Ionisers.
B.Air-conditioners.
C.Exhaust-fans
D.Vacuum pumps.
5.Some scientists believe that___.
A.watching animals to anticipate earthquakes is more effective than depending on seismography.
B.the unusual behavior of animals cannot be trusted.
C.neither watching nor using seismographs is reliable.
D.earthquake
第三篇答案BCDAA
英语四级真题阅读长难句的分析(二十三)
最新大学英语四级快速阅读的精选:How to Visualize Your Success
英语四级深度的阅读精讲之四
英语四级真题阅读长难句的分析(十五)
英语四级考试的指导:如何提升你的英语阅读技巧
英语四级真题阅读长难句的分析(十一)
巴士公司出台接送孩子的新的有效方案
英语四级考试应试的技巧:怎么有效提高阅读速度
大学英语四级考试必备的课文精选:An Early Morning Walk
最新大学英语四级阅读全真模拟题的精练(第7篇)
英语四级真题阅读长难句的分析(十七)
最新大学英语四级阅读考试过关必备的训练(3)
英语四级真题阅读长难句的分析(八)
最新大学英语四级阅读考试过关必备的训练(6)
英语四级深度的阅读精讲之三
文化的背景对商业运作的影响
英语四级冲刺的指南:阅读理解常见题型解题的方法与技巧
工人阶级的家庭起居室的最基本要素
英语四级真题阅读长难句的分析(二十一)
英语四级真题阅读长难句的分析(十)
最新大学英语四级阅读全真模拟题的精练(第8篇)
最新大学英语四级阅读全真模拟题的精练(第10篇)
英语四级真题阅读长难句的分析(十九)
英语四级真题阅读长难句的分析(一)
英语四级真题阅读长难句的分析(二十四)
英语四级考试阅读中英对照:中国食品安全的问题
英语四级真题阅读长难句的分析(五)
旧金山会成为繁荣城市的原因
英语四级真题阅读长难句的分析(十六)
制造商逐步的取代塑料罐
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |