大学英语四级选词填空练习一

CET- 4选词填空练习（一）

文章长度：235 words 建议做题时间：7分钟实际做题时间：______

A Nepali teenager has designed a £23 solar panel using human hair.

Milan Karki, who is 18 years old and lives in a village in rural Nepal, used human hair to replace silicon, which is a common but 1 component of solar panels.

By using hair as a 2 , Karki said that solar panels can be produced for around £23, a price tag that could be 3 if they were mass-produced.

The solar panel works because melanin, the pigment (色素) that gives hair its color, is light 4 and can act as an electrical conductor. Karki was inspired to follow this 5 by a Stephen Hawking book, which 6 how to create static energy from hair.

The device that Karki has 7 is capable of producing 9V or 18W of energy----plenty to 8 a mobile phone.

“Half a kilo of hair can be bought for only 16p in Nepal and whereas a pack of batteries would cost 50p and last a few nights,” according to The Daily Mail.

Milan and his four classmates 9 made the solar panel as an experiment but the teens are 10 it has wide applicability and commercial viability.

Karki has now sent out several devices to other districts near his home for testing. He said, “First I wanted to provide electricity for my home, then my village. Now I am thinking for the whole world.”

A)route B) charge C) important D) expensive

E) declined F) replacement G) explained H) sensitive

I) convinced J) initially K) demonstrated L) simply

M) produced N) halved O) sensible

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选词填空练习（一）参考答案

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