问题 单项选择题 案例分析题

患者,男,15岁,面型略突,面下1/3高,ANB2°,下颌支发育不足,前牙切牙合。上下牙列轻度拥挤,磨牙轻近中关系,上下前牙略唇倾。下牙弓方形,4个第三磨牙牙胚存在

若治疗中垂直向控制不好最容易出现().

A.前牙深覆

B.前牙开

C.前牙反

D.后牙反

E.后牙锁

答案

参考答案:B

操作题
阅读理解

阅读理解。

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

     We can read of things that happened 5.000 years ago in the Near East, where people first learned to write.

   1   The only way that they can preserve their history is to recount it as sagas-  2   These legends are useful

because they can tell us something about migrations of people who lived long ago, but none could write down

what they did. Anthropologists(人类学家) wondered where the remote ancestors of the Polynesian peoples

now living in the Pacific Islands came from.    3       

     But the first people who were like ourselves lived so long ago that even their sagas, if they had any, are

forgotten.   4      

     Fortunately, however, ancient men made tools of stone, because this is easier to shape than other kinds. 

  5   Stone does not decay, and so the tools of long ago have remained when even the bones of the men who

made them have disappeared without trace.

A. They may also have used wood and skins, but these have rotted away.

B. descriptions of what important events happened in ancient times.

C. But there are some parts of the world where even now people can't write.

D. legends handed down from one generation of story-tellers to another.

E. So scientists have neither history nor legends to help them to find out where the first "modern men"

    came from.

F. But there is some doubt who began to write.

G. The sagas of these people explain that some of them came from Indonesia about 2,000 years ago.