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Hawking became world-famous in _______.

A.      his thirties in the 1970’s

B.      the thirties in his 1970

C.      his 30s in 1970’s

D.     the thirties during the 1970

  选A。in one’s thirties 在某人三十多岁时,in/during the 1970s意思是“在二十世纪七十年代”。

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If eighteen-year-old Karki doesn't turn out to be the next Edison, I'll chop off my locks This kid invented a solar pane (嵌板) which uses human hair as a conductor and could provide the world with cheap, green electricity, solving the energy crisis.
Karki, a Nepal teenager, who lives in a village in Rural Nepal, used human hair to replace silicon, which is a common but expensive component of solar panels.
By using hair as a replacement, Karki says solar panels can be produced for around 23 pounds. But if they were mass-produced, Karki says they could be sold for less than half that price, which could make them a quarter of the price of those already on the market.
The solar panel works because melanin, the substance giving hair its color, is light sensitive and can act as an electrical conductor. Karki was inspired to follow this route by a Stephen Hawking book, which explained how to create energy from hair.
The device (设备) Karki has shown is able to produce 9V or 18W of energy -- plenty to charge a mobile phone. Half a kilo of hair can be bought for only 16p in Nepal and lasts a few months, where as a pack of batteries would cost 50p and last a few nights," according to Karki.
Karki has now sent out several devices to other districts near his village for testing. "First I wanted to provide electricity for my home, then my village. Now I am thinking for the world," he said.
Karki says the idea is more important than ever because of the urgent need for renewable energies in the face of limited power sources and global warming. Slowly, natural resources are decreasing. One day we will be in a great crisis. This is an easy solution for the crisis we are having today.
64. What is the best title of the passage?
A. Introduction of Solar Panels            B. Functions of a New Solar Panel
C. Special Solar panel Materials                      D. Karki Invented a New Solar Panel
65. Why did Karki want to invent a solar panel with hair?
A. Because hair is not very expensive.
B. Because silicon is hard to find.
C. Because he wanted to provide electricity for his home.
D. Because the energy crisis is very serious in his home town.
66. From the last paragraph we can know ________.
A, Karki s invention is of great importance       
B. Karki can predict what will happen in the future
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67. The purpose of this passage is to ________.
A. Karki for his great invention          B. introduce a new solar panel
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D

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By using hair as a replacement, Karki says solar panels can be produced for around 23 pounds. But if they were mass-produced, Karki says they could be sold for less than half that price, which could make them a quarter of the price of those already on the market.

The solar panel works because melanin, the substance giving hair its color, is light sensitive and can act as an electrical conductor. Karki was inspired to follow this route by a Stephen Hawking book, which explained how to create energy from hair.

The device (设备) Karki has shown is able to produce 9V or 18W of energy -- plenty to charge a mobile phone. Half a kilo of hair can be bought for only 16p in Nepal and lasts a few months, where as a pack of batteries would cost 50p and last a few nights," according to Karki.

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