问题 选择题

下列物质中,属于纯净物的是(  )

A.高锰酸钾加热后的产物

B.食盐水

C.蒸馏水制成的冰水混合物

D.液态空气

答案

A、高锰酸钾加热后的产物有:锰酸钾和二氧化锰,所以属于混合物,故A错;

B、食盐水中含有氯化钠和水,属于混合物,故B错;

C、蒸馏水制成的冰水混合物只有一种物质水组成,微观上只有水分子,则为纯净物,故C正确;

D、液态空气中含有氧气、氮气、二氧化碳的该物质,所以属于混合物,故D错;

故选C.

完形填空

阅读下面短文并回答问题,然后将答案写到答案卡相应的位置上

(请注意76至79四个小题后面的词数要求)。

[1] Ashley Power’s mother bought a computer for her when she was eight. When she was thirteen, she was surfing the Internet regularly, but she couldn’t find anywhere for teenagers to meet and talk. And one day she thought, “If I had my own website, I’d make it a really interesting site for teenagers.”

[2]So, when Ashley was sixteen, she launched her own website, called Goosehead. She had no idea how big a success it would be, but three years later, the site was the most successful teen site in the USA! It was getting 100,000 hits every day, and Ashley had about 30 employees.

[3] After a few years, the website closed down. Then Ashley, who lives in Los Angeles, was asked to write a book called The Goosehead Guide to Life. The book is about how to design a website and start a business. It begins with a section called “All About Ashley,” where Ashley tells readers what it is like to be the boss of a company when you are only sixteen. “ I was so happy. But it was crazy in a lot of ways. I got very stressed. I mean, I was only sixteen — I didn’t even have a car! If you were sixteen and you had your own company, you’d be stressed, too! 

[4] In an interview Ashley gave advice to teenagers who wanted to start their own business, “Just be strong and have your dreams and work hard at them. And don’t listen when _______, because I heard ‘no’ a lot. Just keep going until you hear ‘yes’!”

小题1:For what purpose did Ashley create GooseHead?(no more than 10 words)

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小题2:What is the main idea of Paragraph 2? (no more than 6 words)

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小题3: According to paragraph 3, what did Ashley do after GooseHead closed down?(no more than 10 words)

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小题4:How did Ashley feel as a young boss of a company?(no more than 5 words)

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小题5: Fill in the blank in Paragraph 4 with proper words.

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单项选择题 A1/A2型题