问题 单项选择题 共用题干题

某患者,半月前前牙折断,已作完善根管治疗,现无不适主诉。检查:左上侧切牙冠折,断面与牙龈平齐,轻度叩痛,无松动,牙龈无明显水肿及充血余牙无异常。

该牙桩冠修复,根尖至少要保留几毫米的根尖封闭()。

A.1~2mm

B.3~8mm

C.3~5mm

D.5~6mm

E.1~6mm

答案

参考答案:C

阅读理解

阅读理解。

     In some Western countries, many children do chores to get pocket money (零花钱). They usually

 start to do this when they ate ten years old.     

     School students have to do homework and study for tests. They don't have much free time on

 weekdays. They often do chores on weekends.   

     Young kids only do easy chores. So they don't get much money. But that's enough. Many of them only 

 want to buy candy (糖果). And candy is cheap! They often help do the dishes, sweep the floor, or feed

 the pet cat or dog. 

     When they get older, they wart to buy more and more things. They want things that ate more expensive

 than candy. So they have to work harder! They often help their parents wash the family car, cut the grass,

 or cook meals.     

     Some jobs are a good way for kids to learn new things. For example, they can learn how rouse a lawn

 mower (割草机) or how to cook. Of course, their parents help them at first. 

1. How do many children get pocket money in some Western countries?

    A. They study hard.   

    B. They do chores.   

    C. They do part-time jobs.               

    D. They ask their parents for it .   

2. When do many, children usually begin to do chores in some Western countries?

    A. At the age of 10.                        

    B. At the age of 13.   

    C. At the age of 15.   

    D. At the age of 17.   

3. Mary wants to get more pocket money to buy something expensive. She may_____.

    A. do the dishes                        

    B. feed the pet cat

    C. cook meals                    

    D. sweep the floor

4. Which of the following is NOT true?

    A. Young kids do easy chores because they can get much money from their parents.   

    B. School students often do chores on Saturdays and Sundays.

    C. If kids get older and want something more expensive,they have to work harder.   

    D. Kids can learn how to cook with the help of their parents.   "

5. The passage mainly tells us how children in some Western countries _____.   

    A. find jobs                          

    B. get pocket money

    C. study at school                        

    D. do chores

单项选择题