LEDs are different from light bulbs in that

试卷相关题目

• 1All 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

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• 2The central part of the Portable Lights technology is

  A.Glass Bulbs．

  B.HB LEDs.

  C.digital clocks.

  D.incandescent lights．

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• 3To 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．

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• 4The 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

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• 5During a hurricane one should stay away from_____________.

  A.inland flooding

  B.natural disaster

  C.early warning

  D.windows and glass doors

  E.a constant speed

  F.different labels

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• 6"Spider" and "bird" mentioned in Paragraph 1 are examples to illustrate

  A.there are numerous living species on Earth.

  B.animals are people's friends.

  C.it is easy to see spiders and birds.

  D.there are many types of spiders and birds.

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• 7The goal of the creation of the EOL is to

  A.collect enough data to analyze the living species on Earth.

  B.enlarge an existing Web site of the living species on Earth.

  C.add new information to the existing databases of the living species on Earth.

  D.work out an easy-to-use catalog of every living species on Earth.

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• 8At the starting stage, the EOL will get information from

  A.all the Web sites available.

  B.databases built up by its creators.

  C.the existing scientific databases.

  D.nonscientists with specialized knowledg

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• 9The word "novice" in Paragraph 5 could be best replaced by

  A.scientist.

  B.creator.

  C.beginner

  D.expert.

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• 10Which of the following statement is NOT true？

  A.Scientist will review every piece of information added to EOL

  B.The EOL will be beneficial to school kids with its development.

  C.Scientists have cataloged only a small part of the living species on Earth.

  D.People with different interests and knowledge will in a way find the EOL useful.

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