对于中线的解释哪一个是正确的（） A.平分颅面部为两等分的一条_爱下问搜题

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问题单项选择题

对于中线的解释哪一个是正确的（）

A.平分颅面部为两等分的一条假想线

B.穿过两眼中间的一条假想线

C.将牙弓分成两等分的一条假想线

D.平分颅面部为左右两等分的一条假想线

E.矢状缝

答案

参考答案：D

阅读理解

阅读理解。

Our teeth are very important, but how to take care of the teeth? Most people don't know. To help
more people pay attention to their teeth heath, China sets up the first Love Teeth Day on September 20,
1989. Every year on this day, there are many different kinds of activities to tell people how to take care
of their teeth.
After more than 20 years, now Chinese people care more about their teeth. Many people know how
to brush their teeth in right way. They can take good care of.

If you want to be a good kid, please do it by the following ways.
1. Respect your parents.
2. Clean your room, do the dishes, take out the trash (垃圾), and so on.
3. Be polite to people. Say goodbye when you go out. Say thank you when others help you.
4. Study hard at school.
5. Ask questions in class.
6. Learn to smile. This will show your parent that you are enjoying life.

1. When is Love Teeth Day?

A. September 20, 1989.
B. October 1, 1989.
C. October 20, 1989.
D. September 10, 1989.

2. How many Love Teeth Days do we have by 2010?

A. more than 10
B. more than 15
C. more than 18
D. more than 20

3. A good kid should (应该) be_____ to people.

A. bad
B. polite
C. bored
D. boring

4. _____ will show your parents that you are enjoy life.

A. Smiling
B. Talking
C. Studying
D. Crying

5. As a good kid, you shouldn't _____. 　

A. clean your room
B. study hard
C. look for any trouble
D. thank others

填空题

一亿五千零六十万写作（），它是一个（）位数，它的最高位是（）位。