选择题与非选择题灵活拆组卷四　

　　非选择题专练卷(共2页，满分35分)

　　.任务型阅读(共10小题；每小题1分，满分10分)

　　请认真阅读下面短文，并根据所读内容在文章后表格中的空格里填入一个最恰当的单词。

　　注意：每个空格只填1个单词。

　　(2015·镇江高三模拟)

　　Why Blue LED Lights Won the Nobel

　　The 2017 Nobel Prize in physics went to three scientists who gave lighting a big change by inventing blue LED lights. A big change in lighting efficiency is under way around the world.

　　Save and green

　　LEDs use less energy than other forms of lighting. A typical LED bulb (灯泡) can produce around 83 lumens per watt — a measure of how much brightness you can get from a unit of electrical power — much more efficient than other lighting facilities.

　　LEDs produce light by passing electric current through a semiconductor, while traditional bulbs pass current through a wire. The wasted heat energy is chiefly why traditional bulbs are so much less efficient.

　　LEDs also last about 30 times longer than traditional bulbs, and many LED bulb products promise up to 25,000 hours of use — more than 17 years if you used one for about four hours a day.

　　Lighting the world

　　The lighting transformation is not only in homes. LEDs are also being used for street lights, public holiday and decorative displays, commercial buildings, and other large energy users.

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