问题 单项选择题

塑料全冠修复时牙颈部制成肩台是为了

A.有利于美观

B.有利于边缘密合

C.有利于保护牙髓

D.有利于抗力

E.有利于固位

答案

参考答案:D

解析: 塑料材料的主要缺点是材料强度较差,所以修复体必须有适当的体积和厚度,才能使修复体有良好的抗力。修复时牙颈部制成肩台是为了增加全冠边缘厚度,以增加修复体边缘的抗力。

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。

     Students will need to use all of their skills in order to understand the reading selections in Reader's

Choice. 

     1_____ These selections provide practice on employing different reading skills to get the message

of the writer. They also give students practice in four basic reading skills: skimming, scanning, reading

for thorough comprehension, and critical reading.

     Skimming involves reading quickly through a text to get an overall idea of its contents. This kind of

rapid reading is suitable when you are trying to decide if careful reading is desirable or 2_____

     Like skimming, scanning is also quick reading. However, in this case the search is more concentrated.

3_____ When you read to find a particular date, or number you are scanning.

     Reading for thorough comprehension is carefully reading in order to understand the total meaning of

the passage. At this level of comprehension the reader is able to summarize the author's ideas 4_____

     Critical reading demands that a reader makes judgments about what he or she reads. This kind of read

requires posting arid answering questions such as "5_____", "Do I share the author's point of view?" and

"Am I convinced by the author's arguments and evidence?"

A. Does my own experience support that of the author?

B. Reader's Choice is one of the most popular magazines in the world.

C. but has not yet made a critical evaluation of those ideas.

D. The book contains many types of selections on a wide variety of topics.

E. To scan is to read quickly in order to find out specific information.

F. Do I know about the author? G. when there is no time to read something carefully.

单项选择题