Recent research has claimed that an excess of positive ions（离子）in the air can have an ill effect on people’s physical or psychological health. What are positive ions? Well, the air is full of ions, electrically charged particle, and generally there is a rough balance between the positive and the negative charged. But sometimes this balance becomes disturbed and a large proportion of positive ions are found. This happens naturally before thunderstorms,earthquakes of when winds such as the mistral（寒冷的西北风）are blowing in certain countries. Or it can be caused by a build-up of static electricity（静电）indoors from carpets or clothing made of man-made fibers, 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（恶心）or even mental disturbance. Animals are also found to be 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 are near the sea, close to waterfalls of fountains, or in any place where water is sprayed, or forms a spray. This probably accounts for the beneficial effort 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 ionizers: small portable machines which generate negative ions. They claim that ionizers not only clean and refresh the air but also improve the health of people 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 observing the effects on themselves, or on others, of a negative rich or poor environment. After all, it is debatable whether depending on seismic（地震的）readings to anticipate earthquakes is more effective than watching the cat.
1. What effect does excessive positive ionization have on some people?
2. According to the passage, static electricity can be caused by（ ）.
3. A high negative ion count is likely to be found（ ）.
4. What kind of machine can generate negative ions indoors?
5. Some scientists believe that（ ）.
