现代学校教育制度最早产生于（）。 A.中国 B.印度 C.美洲 D.欧洲

表面粗糙度代号，可标注在（）上。

Ⅰ．可见轮廓线；

Ⅱ．引出线；

Ⅲ．尺寸界线。

A．Ⅰ+Ⅱ

B．Ⅰ+Ⅲ

C．Ⅱ+Ⅲ

D．Ⅰ+Ⅱ+Ⅲ

阅读理解。

      Parents whose children show a special interest in a sport feel very difficult to make a decision about their

children's careers. Should they allow their children to train to become top sports men and women? For many

children it means starting schoolwork very young, and going out with friends and other interests have to take

a second place. It's very difficult to explain to a young child why he or she has to train five hours a day, even

at the weekend, when most of his or her friends are playing.

      Another problem is of course money. In many countries money for training is available from government

for the very best young sportsmen and women. If this help can not be given, it means that it is the parents

who have to find the time and the money to support their child's development and sports clothes, transport to

competitions, special equipment, etc. Can all be very expensive?

      Many parents are worried that it is dangerous to start serious training in a sport at an early age. Some

doctors agree that young muscles may be damaged by training before they are properly developed. Professional

(专业的) trainers, however, believe that it is only by training young that you can reach the top as a successful

sports person. It is clear that very few people do reach the top, and both parents and children should be

prepared for failure even after many years of training.

1. This article is most probably taken from ____. [ ]

A. a letter

B. an advertisement

C. a personal diary

D. a newspaper article

2. According to the passage, parents whose children show a special interest in sport ____. [ ]

A. feel uncertain if they should let their children train to be sports men or women.

B. try to get financial(财政的) support from the government for their children's training.

C. have to get medical advice from doctors about training methods.

D. prefer their children to be trained as young as possible.

3. Which of the following statements is NOT true? [ ]

A. By starting young, you won't have much time for your schoolwork.

B. Early training may damage your muscles.

C. Most children may become professional sports men after a long period of training.

D. It's very expensive for parents to support their child's development in sports.

4. The phrase "to take a second place" means ____. [ ]

A. to repeat the activities some other day

B. to become less important

C. of all the things, they are the most important

D. to happen again

5. ____ can become the best players after many years of training. [ ]

A. Most people

B. Some people

C. Hardly any people

D. No people

正常覆合时，下颌前牙切缘咬在上颌前牙舌面的( )。

A．切1/3以内
B．中1/3以内
C．颈1/3
D．对刃
E．牙根部

不能防止计算飞机感染病毒的措施是（）

A.定时备份重要文件

B.经常更新操作系统

C.除非确切知道附件内容，否则不要打开电子邮件附件

D.重要部门的计算机尽量专机专用与外界隔绝

生命风格