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Many years ago, people didn't know how to (1)　 their teeth. They used charcoal (木炭), lemon juice, ash (the stuff left over from fire) or tobacco and honey (2)　together to clean their teeth! It was only about 100 years ago (3) someone(4)　 toothpaste to clean teeth. Most people don't know that snails (蜗牛) have teeth. But they (5) . In fact, they have around 25,600!

Rats chew to wear out their front teeth. If they lose a top tooth, the bottom tooth will grow up in its place. And it won't (6)　! It will grow right into their brain. John Massis (7) Belgium (比利时) was famous for his strong teeth. On April 4, 1974, John Massis went to New York to (8) his teeth. He bit down on a long thick rope. The rope was tied to two trains. They weighted 80 tons. He (9) the trains away for several metres with his teeth. People have used fake teeth for many years. (10)　ndline, they used other people's teeth, animals' teeth, and wooden teeth! The (11)　 president (总统) of the United States, George Washington, had bad teeth. (12) he used fake ones made from animal teeth. But they hurt when he (13) ndline. And they went bad after a short time. Queen Elizabeth I of England used to have a serious tooth (14) .(15)　her time, fake teeth were hard to find in England. She was always in pain. Her fake teeth were made out of porcelain (瓷), which is often used to make plates. They were difficult to eat with.

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阅读理解，阅读下面的短文，然后根据短文内容，在每小题所给的四个选项中选出最佳选项。

　　Mrs．Thompson came to the 5^th grade class and noticed that Teddy was always alone．Also, he did badly in his studies．When she reviewed Teddy's past records，she find he was a good child at first，but he began to change when his mother got ill．Finally he lost interest in school after his mother's death．

　　Mrs．Thompson realized the problem and felt sorry for him．She felt even worse when her students brought her beautifully-covered Christmas presents．His presents were covered with some old paper．Some children laughed when she found a bracelet(手镯)with some of the stones missing, and a bottle with a little perfume(香水)．But she said how pretty the bracelet was, putting it on, and dabbing some perfume on her hand．Teddy stayed after schoul for a long time just to say，“Mrs．Thompson，today you smelled just like my mom used to．”After the child left，she cried for quite a long time．

　　On that very day，she taught not only knowledge but also children．As she worked with

　　Teddy，his mind seemed to come alive．By the end of the year，Teddy had become one of the smartest children in the class．

　　A year later，Teddy left school．She found a note under her door，from Teddy，saying that she was the best teacher he ever had in his life．After that, these words were repeated in each of his letters to her．

　　Then after he finished college, Teddy wrote telling her that he had met a pretty girl and was going to get married．He explained that his father was dead，and that he wondered if Mrs．Thompson might sit at the wedding in the place for the mother of the groom(新郎)．

　　Of course，Mrs．Thompson did．She wore the bracelet and the perfume that Teddy remembered his mother wearing on their last Christmas together．

　　They hugged(拥抱)each other，and Teddy whispered in Mrs．Thompson's ear，“Thank you，Mrs．Thompson，for making me feel important，and showing me that I could make a difference．”

　　Mrs．Thompson，with tears in her eyes，whispered back，“Teddy，it's not like that．You were the one who taught me that I could make a difference．I didn't know how to teach until I met you．”

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