2. 外语
  3. A new report says nearly four-billion people have major tooth decay, or cavities(龋洞). Health officials are warning that【B1】_____

A new report says nearly four-billion people have major tooth decay, or cavities(龋洞). Health officials are warning that【B1】_____

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问题     A new report says nearly four-billion people have major tooth decay, or cavities(龋洞). Health officials are warning that【B1】_____to repair cavities can lead to social and emotional problems.
    Wagner Marcenes is with the Institute of Dentistry at Queen Mary, University of London. He led a team of researchers as part of the Global Burden of Disease 2010 study. About 500 researchers【B2】_____ collect and examine studies about all major diseases. They used the information to【B3】_____ rates of the infection.
    Prof. Marcenes says cavities or holes in【B4】_____teeth are also known as caries. "Caries is a chronic disease that shares the same risk factors as cancer and cardiovascular(心血管的)disease. What we’re having now is an increase in disease【B5】_____from highly developed countries to sub-Saharan Africa and probably it will be in other areas of Africa, too."
    He says an increase in tooth decay in Africa could be a【B6】_____of developing countries becoming more like Western nations. "Our industrialized diet leads to chronic disease. And that may be the main explanation." Western diets【B7】_____sugar, a leading cause of health problems in the mouth. In western countries, water supplies【B8】_____the chemical fluoride(氟). Adding fluoride to the water makes teeth 【B9】_____to the bacteria that can cause tooth decay.
    Wagner Marcenes is calling for an "urgent, organized, social response" to the widespread lack of oral health. He believes in a natural method to【B10】_____ tooth decay by having a healthier diet. He is also calling for the development of new and less costly dental materials and treatments.
【B5】
选项
答案happening
解析 空格所在句子不缺少主干成分，结合句意，空格处应填入动词(词组)的非谓语形式作伴随状语。结合录音可填入happening，意为“发生”。
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