问题 填空题

飞机机翼横截面的形状上下不对称,是利用流体流速越______,压强越小的原理,使飞机产生向上的升力.采用涡轮喷气发动机的飞机,在飞行时,向后高速喷出燃烧气体,飞机便向前运动,这表明物体间力的作用是______.

答案

飞机机翼上方是凸形的,下方是平的,相同时间内,空气通过上方的路程大,通过下方的路程小,通过上方的速度大,通过下方的速度小,根据流体流速越大,压强越小得,飞机机翼上方的压强小,下方压强大,机翼受到压强差的作用,受到压力差的作用,产生向上的升力作用.

喷气飞机向后喷出气体,给空气一个向后的力的作用,根据物体间力的作用是相互的,空气给飞机一个向前的推动力的作用,飞机向前运动.

故答案为:大;相互的.

完形填空

阅读短文,根据每小题的具体要求回答问题。请将答案写在答题卡上的规定位置。(共5小题;每小题2分,满分10分)

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.”

  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.

  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!”

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)

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

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

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

小题5:Fill in the blank in Paragraph 4 with proper words.  (no more than 10 words)