A. use much more electricity
B. last much longer
C. cost much more money
D. provide more colorful lighting
()4. We can infer from the passage that Professor IrvineHalliday .
A. actually invented LEDs
B. visits the poor in the Himalayas every year
C. works in the University of Calgary
D. is still working on developing a lowercost lighting system
()5. What is the main idea of this passage?
A. The invention of LEDs.
B. Bringing light to homes in poor countries.
C. What Professor IrvineHalliday did for the poor.
D. Living conditions in the Himalayas.
Kill two birds with one stone.
一箭双雕。
详解详析
这篇文章介绍了IrvineHalliday教授研制LED节能灯的起因及过程,还介绍了这位教授下一步的研究目标。
1. C细节理解题。文章第三段内容介绍了煤油灯的危害,文章第四段第一句Kerosene costs less than other forms of lighting,… 可知不是很昂贵。故选C。
2. C推理判断题。结合文章第四段和第五段的开头可知IrvineHalliday教授研制该LED灯的主要目的。
3. B细节理解题。根据文章第五段最后一句中的and last much longer可知该灯寿命较长。
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