2. 外语
  3. The previous passage is to be continued by the following passage about asbesto-related diseases, in which four phrases have been

The previous passage is to be continued by the following passage about asbesto-related diseases, in which four phrases have been

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问题     The previous passage is to be continued by the following passage about asbesto-related diseases, in which four phrases have been left out. Read the passage and select the best phrase from the box for each gap. You should decide on the best choice and mark the corresponding letter on the Answer Sheet with a single line through the center.

    The inhalation of asbestos particles is associated with a number of lung diseases such as asbestosis and lung cancer. Asbestosis is caused by the entry of asbestos particles into the walls of the alveoli ,【B17】______. The lung loses its elasticity and may change shape. The initial symptoms of asbestosis are a tightness in the chest and breathlessness. In its later stages,sufferers【B18】______.
    Lung cancer,the generic term for malignant tumors of the alveoli and bronchial tubes,has been shown to be directly related to the inhalation of asbestos particles. As in the case of asbestosis,there is generally a period of latency【B19】______.despite the absence of further exposure. Research suggests that there is a direct correlation between the degree of exposure to asbestos and the incidence of lung cancers. Where exposure occurs,the level of risk is further increased by cigarette smoking. Asbestos workers who smoke cigarettes have a 90% greater risks of contracting lung cancer than workers who do not smoke.
    Exposure to blue asbestos has been shown to produce mesothelioma,a rare cancer of the outer lining of the lung or pleura. In a normal population【B20】______. Where epidemiological surveys have revealed a higher incidence of the disease, it is almost always related to asbestos exposure.
【B20】
选项
答案A
解析 由空格后的“a higher incidence”可知，空格处所填内容和此形成对比。据此可知。正确答案为A。
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