2. 职称英语
  3. Most people are aware that outdoor air pollution can damage their health, bu

Most people are aware that outdoor air pollution can damage their health, bu

游客2023-08-19  16
问题     Most people are aware that outdoor air pollution can damage their health, but many do not know that indoor air pollution also can cause【B1】______ health effects. U.S. Environmental Protection Agency studies of human exposure to air pollutants indicate that indoor levels of pollutants may be 2 to 5 times, and【B2】______ more than 100 times, higher than outdoor levels. These levels of indoor air pollutants may be of particular concern because most people spend about 90% of their time indoors.
    Many sources of indoor air pollution can be found in any home or office. Health effects from indoor air pollutants may be【B3】______ soon after exposure or, possibly, years later. Immediate effects may【B4】______ after a single exposure or repeated exposures. These include headaches, dizziness,【B5】______, and irritation(疼痛)of the eyes, nose, and throat. Such immediate effects are usually short-term and treatable. Sometimes the treatment is simply 【B6】______ the person’s exposure to the source of the pollution, if it can be identified. The likelihood of immediate reactions to indoor air pollutants【B7】______ several factors. Age and preexisting medical conditions are two important【B8】______.
    Certain immediate effects are similar to those from colds or other diseases, so it is often difficult to determine if the symptoms are a result of exposure to indoor air pollution. For this reason, it is important to【B9】______ the time and place symptoms occur. If the symptoms 【B10】______ or go away when a person is away from home, for example, an effort should be made to identify indoor air pollutant sources that may be possible causes. [br] 【B2】
选项
答案 occasionally
解析 若去除此空，并不影响句子大意，故推断空格处应填入虚词。occasionally意为“有时候”，拼写时要注意双写c和l。
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