第4部分：閱讀理解（第31~45題，每題3分，共45分）

下面有3篇短文，每篇短文后有5道題。請根據(jù)短文內(nèi)容，為每題確定1個(gè)最佳選項(xiàng)。

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 （輕便的）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 （高亮度發(fā)光二極管），or HB LEDs. These tiny lights appear in digital clocks，televisions，and streetlights．

LEDs are completely different from the light bulbs （燈泡）．Most of those glass bulbs belong to a type called incandescent lights （白熾燈）．Inside，electricity heats a metal coil （線圈）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.

31 C 文章第一段第二句提到"That's because it's too expensive to string power lines to the remote mountain areas where they live"，說明因?yàn)榧茈娋€對于墨西哥的維喬人太昂貴了，所以他們沒有使用電。答案為 C。

32 A 文章第一段第四句提到 "They sell their art in cities hundreds of miles away from their villages" ，即"他們將他們的藝術(shù)品賣到距村莊幾百里之外的城市"。答案為 A。

33 B 文章第四段第一句話提到 "At the core of Portable Lights technology are devices called high-brightness light-emitting diodes, or HB LEDs"，所以可知這種移動(dòng)燈的核心技術(shù)是高亮度發(fā)光二極管，或簡稱 HB LEDs。答案為 B。

34 C 文章第五段最后幾句話 "Ninety percent of energy produced by incandescent lights，however, is heat-and invisible. With all that wasted energy, bulbs burn out quickly. They are also easily broken"，說明"白熾燈產(chǎn)生的90% 的能量都是熱量，而熱量是不可見的。 并且由于浪費(fèi)了很多能量，白熾燈消耗能量的速度很快。另外白熾燈很容易被損壞"。文章沒有提到"燈光亮度不夠"，所以答案為 C。

35 A 文章最后一段的第三句話提到"Unlike incandescent bulbs, they can produce light of various colors"，說明"與白熾燈不同，他們可以產(chǎn)生各種各樣的顏色"，所以答案為 A。

（責(zé)任編輯：vstara）

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