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17.解：(1)物体A运动到C点前对B有T一mBg=mBa(2分)对A有magsin 0一T一umAg cos 0=mAa(2分)代入数据解得a=一2m/s2,T=8N。(1分)(2)物体A沿斜面向下运动到C点的过程，对A、B组成的系统，由动能定理得mAgL sin 0一mBgL umAgL cos 0=(mA+mB)(2一vo2)(2分)解得v=3m/s。(1分)(3)物体A从接触弹簧到将弹簧压缩到最短，之后又恰好回到C点的过程，对A、B组成的系统，由动能定理得umAg cos0.2x=0-(m+mB)2(2分)由能量守恒定律得Ep+mBgx-mAgxsin 0-umag cos 0.x=0(2分)27解得x=321m,Ep≈8.44J。(2分)

Some inventions are so useful, but seem so simple, that we wonder why no one thought of them long ago.

Post-it Notes were invented about twenty years ago by Art Fry, a scientist at 3M Company. The idea for the product came from an awful experience he often had while singing in his church choir. Fry used pieces of paper as bookmarks to mark the places in his book of songs, but these bookmarks were always falling out. Around that time, Fry heard about a new adhesive (粘合剂) that a colleague, Dr. Spence Silver, had created. This adhesive was special because it was strong enough to hold papers together, but not strong enough to tear the paper when it was removed.

A short time later, Fry realized that his new invention had even more uses than being a great bookmark. He came to this realization when he wrote a note on one of his new “bookmarks” and attached it to a report he was going to give to a colleague. Soon, co-workers were asking Fry for more of his invention so that they could use the new type of notes themselves.

Fry and some other people at 3M believed so much in the new product that they asked the company to give away thousands of the “sticky pieces of paper” for trial use. When some salespeople at 3M went to offices and showed workers just how helpful the new type of notes could be, they immediately received many orders. As more and more people discovered how useful Post-it Notes could be, the product took off.

1.How did Dr. Spence help Art Fry?

A. His adhesive made Arts invention possible.

B. He offered the new adhesive to Art.

C. He created the Post-it Notes.

D. He often worked and discussed science with Art.

2.Which of the following is a possible use of Post-it Notes?

A. A postcard from abroad.

B. An ad in a newspaper.

C. A note on a friends door.

D. An e-mail to a friend.

3.Which of the following shows the proper order of the events?

a. The company gave away many sticky pieces of paper for people to try.

b. Dr. Spence created a new adhesive.

c. Many orders were received and the Post-it Notes became successful.

d. Fry invented Post-it Notes.

e. His colleagues began to use the new types of notes themselves.

A. d b a e c B. b a e d c

C. b d e a c D. d e a b c

4.In which column of a newspaper can we read this passage?

A. Economy B. Recreation C. Culture D. Science

试题答案

1.A

2.C

3.C

4.D

【解析】

试题分析：本文是一篇记叙文，讲述了便利贴大约20年前由阿特.弗莱发明的，3M公司的一个科学家。弗莱听说一种他的同事斯朋斯.西尔佛发明的一种新粘合剂， 够强把纸粘在一起，但当把它使掉时又够弱不会把纸撕坏。后来弗莱把一些粘合剂放在一张纸的边上，正如他希望的，做成 了一个完美的书签。

1. Fry heard about a new adhesive (粘合剂) that a colleague, Dr. Spence Silver, had created可知，他听说斯朋斯.西尔佛发明了粘合剂，他才发明了便利贴，所以斯朋斯.西尔佛发明的粘合剂才导致了他的便利贴，所以选A。

2.

3.

4.

考点：考查科学知识类短文阅读

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