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第2部分：阅读判断（第16～22题，每题1分，共7分）
下面的短文后列出了7个句子，请根据短文的内容对每个句子做出判断：如果该句提供的是正确信息，请选择A；如果该句提供的是错误信息，请选择B；如果该句的信息文中没有提及，请选择C.
Importance of Childrens Oral Health
February is National Childrens Dental （牙齿的）Health Month， but in children good oral care is critical every day. The first comprehensive study on the nations oral health， released recently by the Office of the U.S. Surgeon General， calls dental and oral diseases a silent epidemic （流行病）， even in children. The report states that more than 51 million school hours are lost each year to dental-related illness. In fact， a recent study pointed to dental care as the most common unmet health need among American children.
To help counter this， the American Academy of Periodontology （牙周病学） （AAP） is launching an effort to educate children and parents about the prevention of dental diseases in children.
This is important because oral problems can impact self-esteem for children and lead to problems of eating， speaking and attending to learning， said Michael McGuire， president of the AAP.
Common dental problems seen in children are cavities （龋洞） and gingivitis （龈牙）， which are found in the majority of U.S. children. When these problems are not caught early and treated， they can develop into more severe problems and cause unnecessary suffering， said McGuire However， much of the time， oral problems are avoidable problems.
In the Rio Grande Valley in Texas， a group of more than 120 dentists volunteers to deliver dental care to thousands of low-income children each year with its Mobile Dental Unit that travels from school to school.
According to the Surgeon Generals Report， about 37 percent of children have not had a dental visit before starting school， said McGuire. When children dont see dentists they miss the opportunity to have problems caught early before they develop into larger， more expensive problems to treat， and parents miss the opportunity to learn how to promote good oral habits in their children.
16 Only in February should attention be paid to childrens oral health
A Right B Wrong C Not mentioned
17 Dental and oral diseases are common in both adults and children
A Right B Wrong C Not mentioned
18 Boys miss more school hours each year due to dental-related illness
A Right B Wrong C Not mentioned
19 Oral problems in children can develop into more severe problems.
A Right B Wrong C Not mentioned
20 Oral problems can not be avoided in any way
A Right B Wrong C Not mentioned
21 The low-income children are very grateful to the dentists.
A Right B Wrong C Not mentioned
22 Some children have never seen a dentist before starting school.
A Right B Wrong C Not mentioned