问题 单项选择题 B1型题

镍铬合金烤瓷冠龈边缘若为金属边缘,则粘固后长时间使用则会出现()

A.冠粘固后,出现食物嵌塞

B.冠粘固后,出现食物滞留

C.冠粘固后,出现食物不易嚼碎

D.冠粘固后,出现龈缘变黑

E.冠粘固后,出现龈缘苍白

答案

参考答案:D

解析:冠边缘过长时对牙龈造成压迫,是龈缘呈现苍白色。非贵金属烤瓷冠的冠边缘若没有瓷层或者其他方式的保护,在口腔环境中长时间使用会引起牙龈的染色,导致与冠边缘接触的牙龈呈现黑色。

阅读理解

阅读理解。

     When you think of an artist, you probably think of someone painting on canvas (画布). But Guido Daniele

creates fantastic painting of birds, elephants, tigers, and giraffes by painting on skin. Born in Soverato, Italy,

Guido Daniele has been called "Hand Gogh"(after artist Vincent van Gogh) since he began creating works of

art on people's hands in 1990.

     Painting on the hands can be a challenge because, unlike canvas, the skin moves when rubbed. Daniele's

models must remain perfectly still for hours as he paints. He often uses his daughter and his son as his

"canvases".

     Before he can begin to create his "manimals" (the artist's name for his hand animals", Daniele studies

photographs of the animal that he will be painting in order to be able to understand its character and give it life.

"next," he says, "I look at the hand from different perspectives (视角), and I begin to imagine what is the best

way to position the hand for me to paint the animal." He also studies the skin of the model, preferring it to have

little hair and few blemishes (瑕疵).

     Daniele starts by drawing on the model's hand with a pencil. He next paints the skin using watercolors made

specifically for body art. The eyes of Daniele's painted animals look amazingly real, and they are most difficult

part to paint.

     Paintings on hands must eventually be washed away. Guido Daniele says that he's gotten used to this part

and that he doesn't really mind seeing his work washed down the drain (排水沟). "Tomorrow, I will paint the

next one. The important thing is to take many good photographs before washing the hand!"

1. Daniele's paintings are mainly about _____. [ ]

A. scenery

B. plants

C. stories

D. animals

2. In paragraph 3 the author mainly tells us _____. [ ]

A. what Daniele needs to do before painting

B. why Daniele choose to paint "manimals"

C. how Daniele develops his own style of painting

D. how Daniele paints on the skin of his models

3. What does the word "manimals" refer to? [ ]

A. The artists who paint animals on People's hands.

B. The animals which are painted on People's hands by Daniele.

C. The artists who like paint animals.

D. The animals which Daniele uses as models.

4. How does Daniele feel about the fact that his paintings must be washed away? [ ]

A. He feels disappointed at this.

B. He cares little about this.

C. He is satisfied to see this.

D. He in fact can't accept this.

5. What do we learn about Daniele from the passage? [ ]

A. His real name is Hand Gogh.

B. His works are mainly drawn with pencils.

C. He is an artist who paints on hands.

D. He often asks his wife to be his model.

单项选择题