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  3. What is said to be the best way to conserve energy nowadays? How much of the power consumed by incandescent bulbs is converted

What is said to be the best way to conserve energy nowadays? How much of the power consumed by incandescent bulbs is converted

admin2008-12-18  45
问题 What is said to be the best way to conserve energy nowadays?
How much of the power consumed by incandescent bulbs is converted into light?
选项 A、A small portion.
B、Some 40 percent.
C、Almost half.
D、75 to 80 percent.
答案A
解析 本题问“白炽灯泡所耗能量有多少转换为光?”根据题文中“incandescent bulbs”可将相关部分定位于小标题为“Change Bulbs(更换灯泡)”部分。全文第六自然段提到“Lighting eats up 20 percent of the world’s electricity... Forty percent of that powers old-fashioned incandescent light bulbs-- a 19th-century technology that wastes most of the power it consumes on unwanted heat.”，即“照明消耗了世界电力的百分之二十。其中的百分之四十用于老式的白炽灯照明，这是一项十九世纪的技术，该技术将其消耗的大部分能量浪费在人们并不需要的热量上。”也就是说，这种灯泡所耗的能量大部分都浪费了，只有小部分转换为光。因此，A项“小部分”正确。B项 “大约百分之四十”指白炽灯泡耗电占照明耗电总量的比例。C项“几乎将近一半”文中未提到。D项“百分之七十五至八十”，指荧光灯比白炽灯泡少耗电的比例。
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