问题 单项选择题

男,15岁。自诉两日前打篮球时被击中右侧中切牙,因疼痛和影响进食前来就诊。检查见叩痛明显,轻微伸长,放射线检查示根中1/3处有折裂纹,这颗患牙可能的预后转归如下不正确的是()

A.两断端由钙化组织联合,与骨损伤的愈合很相似

B.结缔组织将各段分开,断面上有牙骨质生长,但不出现联合

C.未联合的各段由结缔组织和骨桥分开

D.断端由慢性炎症组织分开,根端多为活髓,冠侧段牙髓常坏死

E.由于根折限于牙槽内,因而对预后不利

答案

参考答案:E

解析:

根折越靠近根尖其预后越好。当根折限于牙槽内时,对预后是很有利的,但折裂累及龈沟或发生龈下折时,常使治疗复杂而且预后亦差。

完形填空

It is the year 2050 now. Tom and I want to visit the Mars. It is a planet (行星) far away from our planet---the      .

Our spaceship (太空船) flew       two weeks to get to the Mars. When we arrived, we       the door of the spaceship and looked out. The weather there      sunny and hot. We saw an alien (外星人) behind a tree.       is very tall and big and has brown hair.“Help me!”     the alien.Then we saw some monsters (怪兽)  running after       alien from the house near a tree. They wanted to kill him. So we had to run away      !We both moved to the        and jumped in. We also took the alien into our spaceship and       him. What an exciting day!

小题1:A. Moon                    B. Earth                C. Sun

小题2:A. for                     B. on                   C. in

小题3:A. closed                B. opened               C. had

小题4:A. did                   B. was                  C. isn’t

小题5:A. Him                     B. He                   C. They

小题6:A. shouted                B. talked               C. told

小题7:A. another                B. other               C. others

小题8:A. quickly                 B. easily              C. luckily

小题9:A. house                   B. spaceship            C. tree

小题10:A.scared                  B. interested           C. saved

单项选择题