2015年职称英语理工类C级模拟试卷二_第3页

　　下面有3篇短文，每篇短文后有5道题。请根据短文内容，为每题确定1个最佳选项。

　　第一篇

　　Weaving With Light

　　In the Sierra Madre mountain range of west central Mexico，the native Huichol people live much the way their ancestors did-without electricity.That's because it's too expensive to string power lines to the remote mountain areas where they live.To help support themselves，the Huichol create beautiful artwork.They sell their art in cities hundreds of miles away from their villages.And without electricity-at home or on the road，they can only work during daylight hours. When it gets dark，they must stop whatever they're doing.

　　Now，a team of scientists，designers，and architects is using new technologies to provide the Huichol with light after the sun sets.The scientists' technique involves weaving tiny electronic crystals into fabrics that can be made into clothes，bags，or other items.

　　By collecting the sun's energy during the day，these lightweight fabrics provide bright white light at night.Their inventors have named the fabrics"Portable (轻便的)Lights."Portable Lights have the potential to transform the lives of people without electricity around the world，says project leader Sheila Kennedy.

　　"Our invention，"Kennedy says，"came from seeing how we could transform technology we saw every day in the United States and move it into new markets for people who didn't have a lot of money."

　　At the core of Portable Light technology are devices called high-brightness light-emitting diodes (高亮度发光二极管)，or HB LEDs. These tiny lights appear in digital clocks，televisions，and streetlights.

　　LEDs are completely different from the light bulbs (灯泡).Most of those glass bulbs belong to a type called incandescent lights (白炽灯).Inside，electricity heats a metal coil (线圈)to about 2，200 degrees Celsius.At that temperature，bulbs give off light we can see.

　　Ninety percent of energy produced by incandescent lights，however，is heat-and invisible. With all that wasted energy，bulbs bum out quickly.They are also easily broken.

　　LEDs，on the other hand，are like tiny pieces of rock made up of molecules (分子)that are arranged in a crystal structure.When an electric current passes through an LED，the crystal structure produces light.Unlike incandescent bulbs，they can produce light of various colors.Within an LED，the type of molecules and their particular arrangement determines what color is produced.

　　31. The Huichol don't use electricity because

　　A. it is too difficult for them to change their lifestyle

　　B. they know nothing about it

　　C. it costs too much to string power lines

　　D. they don't need it

　　32.To make a living，the Huichol create artwork and

　　A.sell it in cities far away from their villages.

　　B.sell it to tourists in their villages.

　　C.display it in their village museum.

　　D.keep it in their homes to attract tourists.

　　33.The central part of the Portable Lights technology is

　　A.Glass Bulbs.

　　B.HB LEDs.

　　C.digital clocks.

　　D.incandescent lights.

　　34. All of the following are disadvantage of incandescent lights EXPECT

　　A. they burn out quickly

　　B. they are easily broken

　　C. they are not bright enough.

　　D. they waste most of the energy produced

　　35.LEDs are different from light bulbs in that

　　A.LEDs can send out light of different colors.

　　B.LEDs are made up of tiny pieces of rock.

　　C.LEDs belong to incandescent lights.

　　D.LEDs look like crystals.

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