Diseases spread in many ways.An infected person can cough or sneeze on someone nearby，or they can spread germs through a handshake.But sometimes we pick up germs indirectly.A sick person might leave behind bacteria or viruses when they touch a door handle，for example.But what if those surfaces could clean themselves？
Two teenagers from Hong Kong asked themselves the same question.Now they've developed a door handle that can kill germs on contact.
The idea is simple.Every time the door is opened，the movement creates power that starts a germ-killing reaction on the handle.In lab tests，their system killed about 99.8 percent of the germs that they spread onto lab dishes covered with their material.
Research by others has shown that door handles in public areas are often home to lots of bacteria and viruses，notes 17-year-old Sum Ming （"Simon"）Wong.He and his schoolmate Kin Pong （Michael） Li，18，wanted to design a covering for door handles that would kill germs.
After doing some research，they learned that a mineral called titanium dioxide （二氧化鈦）is known to kill bacteria.It's already used in many products，from paints to desserts.To make their covering，the teenagers made the mineral into a very fine powder.
Titanium dioxide kills bacteria best when lit by ultraviolet （紫外線的） light，says Simon.UV light is found in sunlight.But UV light does not naturally shine on indoor handles or any used at night，so the teenagers light their door handle from within.
To make sure the light reaches the coated surface，the teenagers made their door handle out of clear glass.Each end fits into a bracket （托架）.Inside one of the brackets is a strong light-emitting diode （LED）.From it comes UV light.
And here's the interesting part：The power that makes the UV light shine comes from opening and closing the door.The power from the door is then carried by wire to the LED inside the door handle.
The door handle system，Michael and Simon say，might cost no more than about ＄13 （about 81 yuan） to build.
（1）The ways diseases spread are mentioned at the beginning of the text toDD.
A．demonstrate how most diseases are spread indirectly
B．remind readers of the importance of cleaning their hands
C．explain how to kill bacteria or viruses effectively
D．help to describe a new invention that prevents diseases from spreading
（2）The LED is placed inside the brackets toCC.
A．supply enough power to the handle system
B．produce titanium dioxide to kill bacteria
C．provide UV light to help titanium dioxide work better
D．direct the UV light in sunlight to the coated surface
（3）What is the author's attitude toward Michael and Simon's door handle system？DD
A．Cautious
B．Critical
C．Disappointed
D．Enthusiastic
【答案】D；C；D
【解答】
【點(diǎn)評(píng)】
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發(fā)布：2024/5/27 14:0:0組卷：3引用：2難度：0.5
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（1）What can we know about Burlington School？
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B．It is located in London.
C．It provides no accommodation.
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2．Hi Judy!
You often complain to me that you always buy goods unreasonably on sale promotion（促銷）and feel it shameful after going back to your school dormitory with new things not needed，considering all the money you spend is your parents' income．
In fact，this is a common phenomenon，called impulsive buying，a buying unplanned and hard to control．It usually happens when a store offers discounts（打折）or sales promotion-a special way used by stores to get more customers，which means you may fall into its traps even without notice．
Stores，with a good knowledge of customers' psychology（心理），make use of it to drive business．Avoiding all the impulsive buying is a hard thing．However，knowing our psychology behind it and reducing the times when influenced by sales promotion may be useful．So you should keep calm when facing the sales promotion by keeping in mind what you really need．
Find out the conditions where you are likely to buy things blindly．When seeing a dress advertised at 20% off，do not concentrate on the discount，but warn yourself against falling into the trap of "saving money''．
Besides，do not forget the long-term effects of your choice when meeting a sales promotion．Short-term benefits，like excited feeling just after buying items encourage impulsive buying．But the long-term costs such as waste of money and the sense of shame really annoy you．When seeing the advertisements，remember what you really want to buy originally and warn yourself of that terrible feeling．Only in this way can you save money for really needed things．
Yours，
Rachel
（1）Judy felt it a shame to．
A．complain to others about the poverty of her family
B．waste her parents' money on unneeded things
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D．rely on her parents for further education
（2）Which of the following is true of impulsive buying according to Rachel？
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（4）How do buyers usually feel in the long run after buying discounted things？
A．Regretful．
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D．Sceptical．發(fā)布：2025/1/10 8:0:1組卷：4引用：2難度：0.6 -
3．Ever since I graduated from high school I've worked in the factories surrounding my hometown every summer.However，making the transformation between school and full-time blue-collar work during the break never gets any easier.For a student like me who considers any class before noon to be unacceptable，getting to a factory by 6 o'clock each morning is suffering.My friends never seem to understand why I'm so relieved to be back at school or that my summer vacation has been anything but a vacation.
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The most stressful thing about blue-collar life is knowing your job could disappear over night.Issues like being laid off and overseas relocation had always seemed distant to me until my co-workers told me that the unit I was working in would shut down within six months and move to Mexico，where people would work for 60 cents an hour.
After working 12-hour shifts（輪班）in a factory，the other options have become only too clear. "This job pays well，but it's hell on the body，" said one co-worker. "Study hard and keep reading." she added.When I'm back at the university，skipping classes and turning in lazy re-writes seems too irresponsible after seeing what I would be doing without school.All the advice and public-service announcements about the value of an education that used to sound stale（陳腐的）now ring true.
My experiences in the factories have inspired me to make the most of my college years before I enter the real world for good.
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C．They think too highly of themselves.
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B．The lack of security.
C．An unstable location.
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A．He became responsible for his work.
B．He learned to be more practical at work.
C．He began to respect blue-collar workers.
D．He came to appreciate his college education.發(fā)布：2025/1/6 16:30:6組卷：0引用：1難度：0.5
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