题目内容

—The battery in my cell phone is running low.   
—I _____that last night before we went to bed.
[     ]
A. was noticing          
B. have noticed          
C. would notice        
D. had noticed
D
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 (10·山东D篇)

Batteries can power anything from small sensors to large systems. While scientists are finding ways to make them smaller but even more powerful, problems can arise when these batteries are much larger and heavier than the devices themselves. University of Missouri(MU) researchers are developing a nuclear energy source that is smaller, lighter and more efficient.

“To provide enough power, we need certain methods with high energy density(密度)”，said Jae Kwon, assistant professor of electrical and computer engineering at MU. “The radioisotope(放射性同位素) battery can provide power density that is much higher than chemical batteries.”

Kwon and his research team have been working on building a small nuclear battery, presently the size and thickness of a penny, intended to power various micro / nanoelectromechanreal systems (M/NEMS). Although nuclear batteries can cause concerns, Kwon said they are safe.

“People hear the word ‘nuclear’ and think of something very dangerous,” he said, “However, nuclear power sources have already been safely powering a variety of devices, such as pace-makers, space satellites and underwater systems.”

His new idea is not only in the battery’s size, but also in its semiconductor(半导体). Kwon’s battery uses a liquid semiconductor rather than a solid semiconductor.

“The key part of using a radioactive battery is that when you harvest the energy, part of the radiation energy can damage the lattice structure(晶体结构) of the solid semiconductor,” Kwon said, “By using a liquid semiconductor, we believe we can minimize that problem.”

Together with J. David Robertson, chemistry professor and associate director of the MU Research Reactor, Kwon is working to build and test the battery. In the future, they hope to increase the battery’s power, shrink its size and try with various other materials. Kwon said that battery could be thinner than the thickness of human hair.

71. Which of the following is true of Jae Kwon?

A. He teaches chemistry at MU. 

B. He developed a chemical battery.

C. He is working on a nuclear energy source.

D. He made a breakthrough in computer engineering.

72. Jae Kwon gave examples in Paragraph 4_________.

A. to show chemical batteries are widely applied.

B. to introduce nuclear batteries can be safely used.

C. to describe a nuclear-powered system.

D. to introduce various energy sources.

73. Liquid semiconductor is used to _________.

A. get rid of the radioactive waste  

B. test the power of nuclear batteries.

C. decrease the size of nuclear batteries

D. reduce the damage to lattice structure.

74. According to Jae Kwon, his nuclear battery _______.

A. uses a solid semiconductor       

B. will soon replace the present ones.

C. could be extremely thin          

D. has passed the final test.

75. The text is most probably a ________.

A. science news report        B. book review   

C. newspaper ad          D. science fiction story

In just minutes a day, plug in and charge your iPhone quickly!
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Use the iPhone while charging it. Even charge the RichardSolo 1800 and iPhone together at the same time. Take only one charger when traveling and wake up in the morning with the RichardSolo and the iPhone charged.
RichardSolo 1800 is largest in its class and holds its charge for months. Works with almost all iPhone cases.
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【小题1】 How long does it take the battery to charge up an iPhone?

A．15 minutes.B．30 minutes.C．1.5 hours.D．3 hours.
【小题2】What is special about the battery?
A．It is built in an iPhone.B．It is the smallest of its kind.
C．It can also be used as a charger.D．It keeps power for about 30 days.
【小题3】 If you are not satisfied with the product, you ______.
A．may get your pre-paid money back with any reason
B．can demand an apology and the money back within 30 days
C．have the privilege of one-month return without any reason
D．are probably unable to have the return privilege with a return label
【小题4】Who mentions the transporting of the battery?
A. P.S.     B. B.L.     C. M.C.     D. T.K.
【小题5】The customer comments on the battery are mainly about its _______.
A．qualityB．serviceC．functionD．shopping

Sunny countries are often poor. A shame, then, that solar power is still quite expensive. Eight19, a British company by Cambridge University, has, however, invented a novel way to get round this. In return for a deposit of around $10 it is supplying poor Kenyan families with a solar cell able to generate 2.5 watts of electricity, a battery that can deliver a three amp（安培） current to store this electricity, and a lamp whose bulb is a light-emitting diode（二极管）. The firm thinks that this system, once the battery is fully charged, is enough to light two small rooms and to power a mobile-phone charger for seven hours. Then, next day, it can be put outside and charged back up again.
The trick is that, to be able to use the electricity, the system's keeper must buy a scratch card—for as little as a dollar—on which is printed a reference number. The keeper sends this reference, plus the serial number of the household solar unit, by SMS to Eight19. The company's server will respond automatically with an access code to the unit. 
Users may consider that they are paying an hourly rate for their electricity. In fact, they are paying off the cost of the unit. After buying around $80 worth of scratch cards—which Eight19 expects would take the average family around 18 months—the user will own it. He will then have the option of continuing to use it for nothing, or of trading it in for a bigger one, perhaps driven by a 10-watt solar cell. 
In that case, he would go then through the same process again, paying off the additional cost of the upgraded kit at a slightly higher rate. Users would therefore increase their electricity supply steadily and affordably.
According to Eight19's figures, this looks like a good deal for customers. The firm believes the average energy-starved Kenyan spends around $10 a month on oil—enough to fuel a couple of smoky lamps—plus $2 on charging his mobile phone in the market-place. Regular users of one of Eight19's basic solar units will spend around half that, before owning it completely. Meanwhile, as the cost of solar technology falls, it should get even cheaper.
【小题1】The underlined word “get round” in the first paragraph can be replaced by _______ .

A．make use of B．come up withC．look intoD．deal with
【小题2】What should the user do when the electricity in the battery is used up?
A．Buy a scratch card. B．Recharge it outside.
C．Buy another solar cell.D．Return it to the company.
【小题3】How much would users pay for the cell and scratch cards before they own a 2.5-watt solar cell?
A．Around $10.B．Around $80.C．Around $90.D．Around $180.
【小题4】It can be inferred from the last paragraph that  ____________.
A．Kenyan families would find it difficult to afford the solar cell
B．using the solar cell would help Kenyan families save money
C．few Kenyan families use mobile phones for lack of electricity
D．the company will make a great profit from selling solar cells
【小题5】What might be the most suitable title for the passage?
A．Solar Energy: Starting from Scratch.
B．Eight19: a creative British Company.
C．Kenyan Families: Using Solar Energy for Free.
D．Poor Countries: Beginning to Use Solar Energy.

Sunny countries are often poor. A shame, then, that solar power is still quite expensive. Eight19, a British company by Cambridge University, has, however, invented a novel way to get round this. In return for a deposit of around $10 it is supplying poor Kenyan families with a solar cell able to generate 2.5 watts of electricity, a battery that can deliver a three amp（安培） current to store this electricity, and a lamp whose bulb is a light-emitting diode（二极管）. The firm thinks that this system, once the battery is fully charged, is enough to light two small rooms and to power a mobile-phone charger for seven hours. Then, next day, it can be put outside and charged back up again.

The trick is that, to be able to use the electricity, the system's keeper must buy a scratch card—for as little as a dollar—on which is printed a reference number. The keeper sends this reference, plus the serial number of the household solar unit, by SMS to Eight19. The company's server will respond automatically with an access code to the unit. 

Users may consider that they are paying an hourly rate for their electricity. In fact, they are paying off the cost of the unit. After buying around $80 worth of scratch cards—which Eight19 expects would take the average family around 18 months—the user will own it. He will then have the option of continuing to use it for nothing, or of trading it in for a bigger one, perhaps driven by a 10-watt solar cell. 

In that case, he would go then through the same process again, paying off the additional cost of the upgraded kit at a slightly higher rate. Users would therefore increase their electricity supply steadily and affordably.

According to Eight19's figures, this looks like a good deal for customers. The firm believes the average energy-starved Kenyan spends around $10 a month on oil—enough to fuel a couple of smoky lamps—plus $2 on charging his mobile phone in the market-place. Regular users of one of Eight19's basic solar units will spend around half that, before owning it completely. Meanwhile, as the cost of solar technology falls, it should get even cheaper.

1.The underlined word “get round” in the first paragraph can be replaced by _______ .

A．make use of       B．come up with       C．look into          D．deal with

2.What should the user do when the electricity in the battery is used up?

A．Buy a scratch card.                      B．Recharge it outside.

C．Buy another solar cell.                    D．Return it to the company.

3.How much would users pay for the cell and scratch cards before they own a 2.5-watt solar cell?

A．Around $10.       B．Around $80.       C．Around $90.       D．Around $180.

4.It can be inferred from the last paragraph that  ____________.

A．Kenyan families would find it difficult to afford the solar cell

B．using the solar cell would help Kenyan families save money

C．few Kenyan families use mobile phones for lack of electricity

D．the company will make a great profit from selling solar cells

5.What might be the most suitable title for the passage?

A．Solar Energy: Starting from Scratch.

B．Eight19: a creative British Company.

C．Kenyan Families: Using Solar Energy for Free.

D．Poor Countries: Beginning to Use Solar Energy.

 

–Do remember to charge the battery 12 hours when you first use it.

--_________.

A．Made it

B．Got it

C．Understood it

D．Remembered it

 

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