题干

下列实验能达到预期目的的是(  )

编号

实验内容

实验目的

A

将SO2通入溴水,溴水褪色后加热观察能否恢复原色

验证SO2漂白的可逆性

B

将氯水加入淀粉KI溶液中 

验证Cl的非金属性比I强

C

把铁块和铜块用导线连接插入浓硝酸中 

组成原电池验证Fe比Cu活泼

D

加热氯化铵和碘单质的固体混合物 

分离除去碘单质

A:A

B:B

C:C

D:D

上一题 下一题 0.0难度 选择题 更新时间:2010-11-27 12:24:27

答案(点此获取答案解析)

B

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    A lot of teenagers are good at art at school, but how would you feel if people called you “the new Picasso(毕加索)” or if presidents and other famous people collected your paintings?

    Alexandra Nechita was ten when her paintings became famous all over the world. She visited Britain, France, Italy, Japan, Australia, New Zealand and her family's native place (祖籍) Romania where 5,000 fans came to see her at the airport. Alexandra said, “When it all started, I was moved. It was very exciting and I loved the traveling, but I got very tired. And I missed home.”

    Alexandra is a good student. Her studies always come first. She only starts painting after she's done her homework. She works on two or three paintings at a time. The paintings sell for thousands and Alexandra's parents have given up their jobs to work for their daughter. Life for the Nechita family is very different from what it was like a few years ago. Alexandra's father Nike left Romania for political (政治的)reasons in 1985. At first he tried his best to learn English and had different kinds of low-paid jobs. In 1987, he brought his wife and Alexandra, who was then 18 months old, to America. The family was very poor. Alexandra began to draw at the age of three.

    She was drawing for four or five hours a day. Soon people offered(提出) to buy her paintings and she had her first art show at the age of eight. Stories about this child appeared(出现) in the newspapers and television. They now live in a large house with a swimming pool. Her mother said, “We started without anything, but thanks to Alexandra, we have everything we ever dreamed of.”