问题 单项选择题

造成髓腔壁穿孔的医源性因素是()

A.牙髓腔解剖不熟悉

B.扩大根管器械锐利

C.重度磨损的磨牙

D.患牙根臂弯曲

E.老年人的磨牙

答案

参考答案:A

解析:临床主要是对牙髓腔解剖不熟悉的情况下髓腔预备才造成髓壁穿孔,所以A正确。考点:造成髓腔壁孔的医源性因素

阅读理解

Shanghai is different from New York in many ways, but there are many things that are similar.

Shanghai is one of the most populated(人口众多的) cities in Asia, and New York is one of the most populated cities in North America. The weather in summer is very hot in Shanghai, and it is the same in New York. Shanghai is a port and industrial city, and New York is too. Shanghai has a problem with pollution, and New York has a similar problem. They both have serious traffic problems.

The traffic problem in Shanghai is caused by many bicycles. The traffic problem in New York is caused by many cars. Most of the people in Shanghai live in apartments in low buildings, while most of the people in New York live in apartments in high buildings. People eat with chopsticks in Shanghai, but they eat with knives and forks in New York. While there are some differences, the main problems of big cities are almost the same everywhere in the world.

66. New York is in _______ .  

A. South Asia     B. North Asia     C. North America     D. South America

67. Shanghai has problems in _______.  

A. pollution             B. population  

C. traffic                D. A, B and C

68. People in New York live in _________.  

A. small houses in low buildings      B. apartment in high buildings

C. apartment in low buildings       D. small houses in high buildings

69. Which of the statements is right?  

A. The weather in Shanghai is hot, white the weather in New York isn't.

B. The traffic problem in Shanghai is caused by cars.

C. People in New York eat with knives and forks.

D. Shanghai is an agricultural city.

70. The main problems of big cities are _______.      

A. different       B. similar     C. complete same     D. polluted.

单项选择题