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It used to take Redwood City, California police hours to locate gunfire. Now, they have a

new tool that helps them find the gunfire quickly. This new tool is called the ShotSpotter. The police began using the ShotSpotter in 1995. They wanted to cut down on gunfire in their city.

One ShotSpotter covers a square mile. Eight microphones are put on the roofs of buildings. These microphones pick up gunfire noise. It only takes seven seconds to report the gunfire to the police. Then a red dot on the police map shows where the action is.

The ShotSpotter really works well. It locates the gunfire within 20 to 40 feet plus or minus. Redwood City police are very happy with the ShotSpotter. They think it might have helped catch the D.C. sniper.

ShotSpotters cost a lot of money. One of them sells for $200,000. Despite the cost, ShotSpotters can be a big help in fighting crime.

Eight microphones placed on rooftops ______.

A．talk to police

B．warn the public

C．listen for gunfire

D．play rap music

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更多“It used to take Redwood City, …”相关的问题

第1题

It ______ 12 rabbits to test a sample of vaccine, now it takes only 6.A．used to takingB．us

It ______ 12 rabbits to test a sample of vaccine, now it takes only 6.

A．used to taking

B．used to take

C．is used to take

D．was used to taking

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第2题

Mr. Jack _____volleyball in the afternoon , but now his leg wounded , ____ in the evening

.

A.used to play … is used to taking a walk

B.used to playing … is used to take a walk

C.was used to playing … used to taking a walk

D.was used to play … used to take a walk

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第3题

It only takes a fraction of a second for the computer to do the____which used to take days

.

A.conclusion

B.experiment

C.explanation

D.calculation

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第4题

Therewouldn’tbeenoughwaterforusifwedidn’t_________.A.turntotheoceansformorewaterB.reuseuse

There wouldn’t be enough water for us if we didn’t _________. A. turn to the oceans for more waterB. reuse used water and make use of seawater C. desalt seawater D. take steps to reuse all water on earth

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第5题

40For every situation, several methods usually exist for effective communication to take p

40 For every situation, several methods usually exist for effective communication to take place. Which of the following is least likely to be used for explaining to the team project planning guidelines？

A. project office memo

B. project office directive

C. project team meeting

D. formal report

E.counseling sessions

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第6题

For every situation, several methods usually exist for effective communication to take pla

ce. Which of the following is least likely to be used for explaining to the team project planning guidelines？

A project office memo

B project office directive

C project team meeting

D formal report

E counseling sessions

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第7题

What does the author mean by saying " these ' temporary' jobs have a habit of becoming per

manent" ？

A．Once college graduates take a temporary job, they soon become used to it.

B．College graduates have developed the habit of taking temporary jobs.

C．Many college graduates might never find jobs for which they were trained.

D．More and more college graduates are unwilling to change their jobs.

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第8题

Hamid is a system administrator for a Linux network.He has been asked to decide which

type of back up schemes his company should use for the mission critical servers.The servers are used heavily all day.He recommends performing one full back up weekly and differential backups daily.Which of the following choices best describes why Hamid did not recommend a daily full backup？()

A.Although full backups are more thorough but they take more time to perform. and slow down other system services.

B.Incremental backups take less time to load than full back ups.

C.Incremental backups offer better data recovery rates than full backups.

D.Linux does not accommodate full backups daily.

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第9题

The water we drink and use is running short in the world.

We all have to learn how to stop wasting our limited water. One of the steps we should take is to find ways of reusing it. Experiments have already been done in this field.

Today in most large cities, fresh water is used only once, then it runs into waste system. But it is possible to pipe the used water to a purifying factory. There it can be filtered and treated with chemicals so that it can be used again, just as it were fresh from a spring.

But even if every large city purified and reused its water, we still would not have enough. Then we could turn to the oceans. All we’d have to do to make use of the seawater on earth is to get rid of the salt.

This process is called desalinization, and it is already in use in many parts of the world.

The way to stop wasting our limited water is to （）.

A.do experiments with water

B.purify the used water and reuse it

C.use fresh water once again

D.make use of seawater

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第10题

When we turn on a tap to get water, or press a switch to get electricity, we do not think

of all the pipes and wires which bring these main services to our homes.

The water is brought from the waterworks to each street by a large underground pipe—a water main. The water in this pipe is then forced by pressure into the smaller pipes which carry it to storage tanks at the tops of the buildings. Other pipes bring the water down from the storage tank to the kitchens and bathrooms in the building.

When the water has been used, it is taken away from the building by drainpipe. These take the waste water to another large pipe under the road—the main sewer. The waste water then flows along the sewer to the sewage works where it is cleaned. This "clean" water is then poured into the sea or into a river, or in some countries, sent back to the waterworks to be used again.

Electricity is also brought to the house by a main, in this case a cable. This cable may be underground or, in country districts, it may hang above ground on pylons. The cable is connected to a meter in the building. This meter measures the amount of electricity that is used in the building. Near the meter there is a master switch which can cut off the supply of electricity. There are also fuse boxes between the master switch and the wires which take the electricity to each of the switches in the building. All these wires, fuses and switches are the "wiring circuit".

It can be inferred from this passage that______.

A．water and electricity are the only main services in our homes

B．the pipes bringing water to our homes are unimportant

C．water is less significant than electricity in our homes

D．we are unaware of how water or electricity is brought to our homes

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第11题

根据以下内容回答下列各题, The water we drink and use is running short in the world． We all

have to learn how to stop wasting our limited water. One of the steps we should take is to find ways of reusing it. Experiments have already been done in this field． Today in most large cities, fresh water is used only once, then it runs into waste system. But it is possible to pipe the used water to a purifying factory. There it can be filtered and treated with chemicals so that it can be used again, just as it were fresh from a spring. But even if every large city purified and reused its water, we still would not have enough. Then we could turn to the oceans. All wed have to do to make use of the seawater on earth is to get rid of the salt. This process is called desalinization, and it is already in use in many parts of the world． The way to stop wasting our limited water is to ________.

A.do experiments with water

B.purify the used water and reuse it

C.use fresh water once again

D.make use of seawater

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