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  3. What is said to be the best way to conserve energy nowadays? [br] How much of th

What is said to be the best way to conserve energy nowadays? [br] How much of th

游客2024-06-18  15
问题 What is said to be the best way to conserve energy nowadays? [br] 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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