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新改革后的英语六级对考生自身的综合知识要求更高了，不再是以往的凭借许多解题技巧便可投机取巧达到高分的目的，相对而言，改革后的六级考试难度增加了许多，要求考生课下更加努力才行。以下是一篇六级阅读模拟练习题，希望考生练完之后能够有所提升。 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. | 
