问题 选择题

下列关于电场线的说法正确的是(  )

A.电场线越密集的地方,场强越小

B.电场线如果相互平行,必定是匀强电场

C.电场线是闭合曲线A7

D.电场线是客观存在的

答案

A、电场线越密集的地方,场强越大;电场线越稀疏的地方,场强越小.故A错误.

    B、电场线如果相互平行,场强的大小和方向处处相同,必定是匀强电场.故B正确.

    C、电场线从正电荷出发到负电荷终止,是不闭合的曲线.故C错误.

    D、电场线是人为假想的曲线,不是客观存在的.故D错误.

故选B

选择题
[ ]

①平等互助   ②团结合作   ③同步富裕   ④艰苦创业   ⑤共同发展

A.①②③④     

B.①③④⑤     

C.②③④⑤     

D.①②④⑤

查看答案
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 paintings 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 the 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 photo- graphs 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 chooses to paint "animals"

C. how Daniele develops this own style of painting

D. how Daniele paints on the skin of his models

3. 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.

4. 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 taints on hands.

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