[交流] 每周一听——那些年我们一起练过的听力（第73期） 已有39人参与

每周一听——那些年我们一起练过的听力（第73期）

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A new report says nearly four-billion people have major tooth decay, or cavities. That number    (1)    more than half of the world's population. Health officials are warning that failure 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    (2)    a team of researchers as part of the Global Burden of Disease 2010 study. About 500 researchers attempt to collect and examine studies about all major diseases. They used the information to estimate    (3)    of the infection.
The report says untreated tooth decay is the most common of all 291 major diseases and injuries. Professor Marcenes says cavities or holes  in    (4)    teeth are also known as caries.
"Caries is a chronic disease that    (5)    the same risk factors as cancer, cardiovascular disease. What we're having now is an increase in disease from highly developed countries happening in 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 result of developing countries becoming more like Western nations.
"It is likely to    (6)    a change in diet. Our industrialized diet leads to chronic disease, which includes caries. And that may be the main explanation."
Western diets are rich in sugar, a leading cause of health problems in the mouth. In western countries,    (7)    are treated with the chemical fluoride. Adding fluoride to the water makes teeth resistant to the bacteria that can cause tooth decay.
Wagner Marcenes says oral health problems can have a major effect on a person's quality of life. First, cavities make eating difficult. Second, people may change what they eat. They may eat softer foods that are not hard to chew. However, softer foods are often    (8)    .
But professor Marcenes says the biggest issue in tooth decay is both social and mental. He says the researchers found strong evidence that the mouth has a big influence on socialization. He says many people want to    (9)    . They smile less and communicate less.
Wagner Marcenes is calling for an "urgent, organized, social response" to the widespread lack of oral health. He believes in a natural method to fight tooth decay by having a healthier diet.    (10)    .


上期活动答案：
1.        investigator
2.        intervention
3.        ethical
4.        deserves
5.        disagrees
6.        compassion or grace
7.        robotics systems
8.        on the aircraft
9.        state sovereignty
10.        the same progress that gives us the technology to strike half a world away also demands the discipline to constrain that power, or risk abusing it