解析:选C。写作目的题。通过本文,作者主要想告诉父母在万圣节给孩子吃什么甜食对他们牙齿腐蚀小。
7. Why are hard candies especially bad for teeth?
A.They may break the children’s teeth.
B.They contain too much sugar.
C.They help bacteria to produce tannins.
D.They stay in the mouth for a long time.
解析:选D。细节理解题。从文中第二段内容可知,黏性的或硬的甜食在人的口腔里存留的时间长,对人的牙齿损伤最大。
8. According to the passage,which of the following is a better choice for Halloween treats?
A.Chocolate.B.Crackers.
C.Raisins.
D.Potato chips.
解析:选A。细节理解题。从最后一段第一句可知答案。
9. According to the passage,which of the following is true of tannins?
A.They are produced when the bacteria digest the food.
B.They help to get rid of some bacteria in the mouth.
C.They help chocolate to dissolve more quickly.
D.They destroy the surface of the teeth.
解析:选B。正误判断题。从最后一段中的“Besides,chocolate contains tannins,which help to kill some of the bacteria in the mouth”可知答案。
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