问题 单项选择题

根管长度测量时,根管长度电测仪无法准确获得根管长度的原因包括()

A.根管内有大量渗出液

B.根管侧穿或牙根折裂

C.根管内有残髓

D.测量时隔湿不当

E.以上均是

答案

参考答案:E

解析:用电子仪器测量根管工作长度,在下列情况下不准确或容易发生误差:有坏死组织碎片、髓腔内有金属充填物、有髓石或异物、根尖尚未形成、意外穿孔、根管内过于潮湿如有多量脓血、唾液或冲洗液等。

阅读理解

On the evening of June 21, 1992, a tall man with brown hair and blue eyes entered the beautiful hall of the Bell Tower Hotel in Xi’an with his bicycle. The hotel workers received him and teleponed the manager, for they had never seen a bicycle in the hotel hall before though they lived in “the kingdom of bicycles”.

Robert Friedlander, an American, arrived in Xi’an on his bicycle trip across Asia which started last December in New Delhi, India. When he was 11, he read the book Marco Polo and made up his mind to visit the Silk Road. Now, after 44 years, he was on the Silk Road in Xi’an and his early dreams were coming true.

Robert Friedlander’s next destinations (目的地) were Lanzhou, Dunhuang, Urumqi, etc. He will complete his trip in Pakistan.

小题1:The best headline (标题) for this newspaper article would be.

A.The Kingdom of Bicycles

B.A Beautiful Hotel in Xi’an

C.Marco Polo and the Silk Road

D.An American Achieving His Aims小题2:The hotel workers told the manager about Friedlander coming to the hotel because______.

A.he asked to see the manager

B.he entered the hall with a bike

C.the manager had to know about all foreign guests

D.the manager knew about his trip and was expecting him小题3:What made Friedlander want to come to China?

A.The stories about Marco Polo.

B.The famous sights in Xi’an.

C.His interest in Chinese silk.

D.His childhood dreams about bicycles.小题4:Friedlander can be said to be.

A.clever

B.friendly

C.hardworking

D.strong-minded

单项选择题