问题 单项选择题

去净龋坏组织主要的临床指标是

A.洞壁的颜色

B.洞底的颜色

C.组织的硬度

D.窝洞的形状

E.器械的硬度

答案

参考答案:C

解析:组织的软硬度是临床判断龋坏组织是否去净的基本的和可行的指标。慢性龋患病时间长,色素渗入常超过软化牙本质层,因此洞底的颜色不可作为去净龋坏组织的主要指标,只能是参考指标。其他干扰答案都与正确答案明显无关。

阅读理解

阅读理解

     Since 1984,   Philadelphia has been cleaning up its act. One by one,   graffiticovered walls are being

changed into outdoor art. So far,   more than 1,   800 murals(壁画)have been painted. Philadelphia now

has more murals than any other American city.

     The walls that were once ugly with graffiti(涂鸦)are now covered with beautiful pictures of historical

heroes and modern art,   thanks to the Mural Arts Program(MAP). Its work makes schools and public

places attractive,   and its citizens very proud. The program began as part of Philadelphia's AntiGraffiti

Network.  Jane Golden is the MAP's artistic director. "When people ask me what our program is about,   "she says,   "I answer them with one word:hope. "Each year,   the MAP offers youth art programs and

workshops.    Some onetime graffiti writers even help paint MAP murals.

     The MAP's work,   says Golden,   is all about developing a sense of community(社区). When a

neighborhood requests a mural,   the MAP works with the people there to develop a message. Some

messages have been "Safe Streets,   ""Love and Care,   " and "Peace Walk".

     The MAP receives up to 50 requests for murals each week. Last year,   the workers painted 140

murals.

     "The making of a mural enters people's collective memory as an extraordinary,   pleasant moment in

neighborhood history,   "says Golden,   who began as a muralist in Los Angeles.

1. What can be the best title for the text?

A. Love,   from Graffiti Writers to Muralists

B. MAP,   a New Company in Philadelphia

C. Jane,   an Excellent Mural Artist

D. Hope,   One Wall at a Time

2. What is the Mural Arts Program in Philadelphia aimed at?

A. Helping the young find jobs.

B. Protecting the neighborhood.

C. Fighting against graffiti.

D. Attracting more visitors.

3. How does the MAP decide on the message for a mural?

A. By having discussions with people in the community.

B. By seeking advice from the city government.

C. By learning from the young graffiti writers.

D. By studying the history of the city.

4. Which of the following best describes the work of the MAP?

A. Difficult.   

B. Dangerous.

C. Experimental.   

D. Successful.

多项选择题