Therootis the part of a tooth that you cannot see because it is deep under the gum.
Most teeth have one or more roots, and the root keeps the tooth firmly in place.
Roots are longer than the part of the tooth you see in your mouth.
At the tip of each root, there are tiny holes where blood vessels and nerves enter the tooth.
The root is covered by a hard layer called cementum, which helps protect it.
Healthy roots are important for strong and stable teeth.
牙根是牙齿隐藏在牙龈下面、看不见的部分。
大多数牙齿都有一个或多个牙根，牙根能让牙齿稳稳地固定在位置上。
牙根比你在口腔里看到的牙齿部分要长。
每个牙根的尖端都有小孔，血管和神经从这里进入牙齿。
牙根外面有一层坚硬的牙骨质，可以保护牙根。
健康的牙根能让牙齿坚固又稳当。
?? 完形填空（Cloze Test）
The root is ______ the gum, so you can’t see it.
（a. above / b. under / c. next to）
Most teeth stay in place because they have strong ______.
（a. roots / b. crowns / c. faces）
Roots are usually ______ than the tooth you see in your mouth.
（a. shorter / b. longer / c. the same）
Blood vessels and nerves get into the tooth through ______ at the end of the root.
（a. holes / b. spots / c. covers）
Healthy roots help keep teeth ______.
（a. loose / b. straight / c. stable）
? 选择题（Multiple Choice）
What part of the tooth is covered by the gum?
A) The root
B) The enamel
C) The top
Why is the hard layer around the root important?
A) It makes the tooth white
B) It protects the root
C) It helps you eat faster
Where do nerves and blood vessels enter the tooth?
A) Through the crown
B) Through holes in the root tip
C) Through the gum only
?? 填空题（Fill in the Blanks）
The hard layer that covers the root is called ______.
（可选答案：cementum, enamel, pulp）
Under the gum, the ______ holds the tooth in place.
（可选答案：root, tongue, dentin）
______ roots help teeth stay strong.
（可选答案：Healthy, Dirty, Cold）
The ______ is the part of the tooth you can see in your mouth.
（可选答案：crown, root, canal）#p#分页标题#e#
完形填空
b. under a. roots b. longer a. holes c. stable选择题
6. A) The root
7. B) It protects the root
8. B) Through holes in the root tip
填空题
9. cementum
10. root
11. Healthy
12. crown
??文章CEFR 等级：A1级
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