题目内容

【题目】The criminal _______ murdering the judge, unfortunately, an unexpected accident made him lose his consciousness.

A.might have admittedB.could have admitted

C.should have admittedD.must have admitted

【答案】B

【解析】

考查情态动词+have done结构。句意:罪犯本可以承认谋杀了法官,但不幸的是,一场意外事故使他失去了知觉。A. might have admitted可能已经,可能性很小;B. could have admitted本来能做成的(却没做成);C. should have admitted本应当做某事;D. must have admitted必定做了……(表示对过去的推测)。结合后文unfortunately, an unexpected accident made him lose his consciousness.可知此处表示罪犯“本可以承认谋杀法官,却没做成”,应用could have done。故选B

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【题目】 Earthquakes are commonthousands of them happen each day.But most are ______ weak to feel.During a ______ earthquakethere is often a great noise first.Then the earth ______ terribly and many houses ______ down.Railway tracks break and trains go ______ linesa great many factories are ______thousands of deaths are causedand many more lose homes...______ the great damage and deaths caused by the earthquake ______other disasters such as fires often______.More buildings are destroyed and more ______ caused.

It is well known of the ______ of a possible earthquakeand for centuries man has been making researches on earthquakes.More than 2,000 years ago______a Chinese scientist named Zhang Heng ______ a machine which could find out from which ______ the seismic(地震的) waves had comeand this machine is still ______ by scientists today.Now we know much more about earthquakes and ______ they happenbut we still cannot ______ exactly when and where an earthquake will happenand cannot ______ it from happening.So earthquakes are among the ______ disasters in the world.

No one can stop natural earthquakes.______scientists can help stop earthquakes destroying whole cities and causing too many deaths.

1A.veryB.tooC.quiteD.so

2A.realB.weakC.bigD.small

3A.movesB.shakesC.jumpsD.breaks

4A.getB.putC.setD.fall

5A.offB.onC.intoD.behind

6A.burstB.struckC.destroyedD.buried

7A.ExceptB.BesidesC.Instead ofD.Because of

8A.lonelyB.laterC.themselvesD.itself

9A.followB.copyC.comeD.enter

10A.quakesB.deathsC.difficultiesD.results

11A.informationB.questionsC.dangersD.frights

12A.as a resultB.in factC.for exampleD.as well

1A.inventedB.discoveredC.foundD.bought

14A.countryB.directionsC.waysD.city

15A.improvedB.repairedC.protectedD.used

16A.whereB.whenC.whatD.why

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【题目】 A cell phone is one of the few things that we hold close to our faces all the time, and yet it could possibly explode – this is what made the recent Samsung’s Galaxy Note 7 smart phone accidents so shocking.

According to technology news website, The Verge, flawed (有瑕疵的) phone batteries might be to blame.

Even if you are not a science student, you probably know that it is common sense that the negative end and the positive end of the battery should never touch. If they do, the battery will short-circuit (短路), causing a powerful electrical reaction that can destroy the battery and cause a fire.

This is why all lithium-ion (锂离子) batteries – the kind that can be found in many of our devices (电子设备) like tablets and cameras – have a separator layer inside to stop the two ends from touching one another.

But somehow, the separators in some of the Samsung phones broke, causing explosions.

Overcharging is another problem that can make batteries heat up quickly. Fortunately, most batteries are designed to be able to automatically stop charging once they are fully charged. But again, this somehow failed to happen in some of the Samsung phones.

According to Lynden Archer, a materials scientist at Cornell University, US, we have already achieved 90 percent of the battery life possible from a lithium-ion battery. Customers’ demands that their devices get thinner and their battery have a longer life have given producers little choice but to try to put more power into thinner batteries. However, the more energy you put into a box, the more dangerous it’s going to be.

1A separator layer is put in lithium-ion batteries in order to ______.

A.ensure a longer battery life

B.reduce a certain electrical reaction

C.connect the anode and the cathode

D.prevent a battery from short circuiting

2What are the possible reasons for the Samsung phone explosions?

A.Pushing the limits of batteries.

B.Short circuiting and overheating.

C.Overcharging and thinner batteries.

D.Automatic charging and broken separators.

3What is the writer’s main purpose of writing the article?

A.To describe problems facing cell phone producers.

B.To warn us about the dangers of lithium-ion batteries.

C.To teach us common sense when it comes to batteries.

D.To explain the reasons for the Samsung phone explosions.

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