Shopping centers，stadiums and universities may soon have a new tool to help fight crime.

A California company called Knightscope says its robots can predict and prevent crime. Knightscope says the goal is to reduce crime by half in areas the robots guard.

William Santana Li is the chief executive officer of Knightscope. He says，"These robot security guards will change the world. Our planet has more than seven billion people on it. It's going to quickly get to nine billion people. The security equipment that we have globally is just not going to develop that fast. The company's Autonomous Data Machines can become the eyes and ears of law enforcement（执法）."

"You want them to be machines plus humans. Let. the machines do the heavy and sometimes dangerous work and let the humans do the strategic decision-making work，so it's always working all together."

The machines do not carry weapons but they have day and night video cameras which are able to turn 360 degrees and can also sense chemical and biological weapons.

Some people may become concerned about their privacy, especially in connection with the video recordings. Some people may worry that such recordings will appear on the Internet. Eugene Volokh, a law professor at the UCLA School of Law, says the machines have to be used in the right way and it will be interesting to see how state laws deal with this kind of video.

William Santana Li says there is a long waiting list for the robots in the US. Workers in the company are working overtime to meet the demands of the market. At least 25 other countries are also interested in these robot security guards.

【小题1】What can this new tool do for humans?

A．Make strategic decisions.

B．Keep watching day and night.

C．Carry heavy weapons.

D．Stop crime autonomously.

【小题2】Why are some people worried about the new robots?

A．Their privacy may be let out.

B．The robots are very expensive.

C．Robots will replace humans.

D．They will be out of work soon.

【小题3】Which of the following can be the best title of the text?

A．Robots Are Becoming More Popular

B．Robots Contribute a Lot to the World

C．Robots Are in Great Demand Now

D．Security Robots Could Help Cut Crime

前不久，你班就是否应该克隆人类的问题进行了辩论，请根据下列要点写一篇100词左右的英语短文。

赞成	证明科学技术的突破； 帮助一些人实现特殊的愿望。
反对	人类生命将像商品一样进行销售； 是对生命的不尊重； 违背自然规律和伦理道德。
你的看法	……

 
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   Scientists are debating how to limit their newly-discovered power to change genetic structure. Scientists have already changed the genes of farm animals and agricultural plants to make them more productive or stronger. But now they can also change genes in wild animals and plants. These genes would continue into later generations. For example，it may be possible for scientists' to remove from existence the kind of mosquitoes that carry the Zika virus. They might also be able to permanently remove species of plants and animals that are destructive to other species.

In a report published last week，the U.S. National Academies of Sciences，Engineering and Medicine said it supports continuing research on this kind of gene control. But it warned that it is not possible to know what will happen when these changed plants and animals are released into the wild.

Sixteen biologists，ethicists（伦理学家）and policymakers are on a National Academy of Sciences（NAS）committee that is examining the issue. They say that there is value to the new technology. But，they say，there is not enough evidence to support the release of changed organisms（生物）from the laboratory into nature.

Many people would support stopping mosquitoes and rats from carrying diseases. But scientists say we must understand the possible scientific，ethical，legal and social results of such action before we decide whether to take it. Gene modification is spread through reproduction（繁殖）.Changed genes will continue to spread as long as an animal or plant continues to reproduce. They cannot be limited to a farm or kept within a country's borders. Scientists are wondering what may happen if a changed organism mates with another species. They are not yet sure how the changed genes would affect the other species. It is possible that those genes could harm those creatures or even lead to their disappearance from our planet.

【小题1】What possible advantage does gene control in wild animals and plants have?

A．Changing the Zika virus permanently.

B．Removing the destructive species forever.

C．Having changed genes in their next generations.

D．Making all the species more productive and stronger.

【小题2】Which of the following is NOT true according to the passage?

A．Scientists are not sure what exact results gene modification leads to.

B．Scientists won't change any genes before they make the final decision.

C．Gene modification has benefited some farm animals and agricultural plants.

D．Scientists have not applied gene modification to wild animals and plants in case of possible danger.

【小题3】As for genetically changed wild animals and plants, what are scientists worried about?

A．They may become weaker or die out.

B．They may be more productive.

C．They may cause damage to their living habitat.

D．Their genes may spread to later generations.

【小题4】What can be the best title for the passage?

A．Stop research on gene control

B．How to change genetic structure

C．Power and danger of gene control

D．Advantages of gene control in wild animals and plants

   According to a study published last week in the journal Science，scientists have found a way to change a plant's genes（基因）in order to make it use sunlight more quickly. Someday，the results could increase the amount of food produced around the world.

By changing a plant's genes，the scientists were able to increase leaf growth on plants by 14-20 percent. Specifically，scientists changed the plant's protective（保护的）system. “Normally，this system is activated when a plant gets too much sunlight，”said scientist Krishna Niyogi，co-author of the study. “When the plant senses the light，it gets rid of extra energy and creates more leaves. When the plant is in the shade，the protective system is turned off. But the process is slow.”

Stephen Long is the lead author of the study. He compared a plant's protective system to light-adjusting glasses.“When a person wears the glasses outside during the day，the lenses（镜片）darken and lighten depending on how sunny it is. Plants do the same thing，”he said.“But in plants the adjustment can take anywhere from 10 minutes to an hour. This makes it hard for plants to get the right amount of sunlight needed to create food.”

The new study sped up the process. By changing the plant's genes，it's more quickly than normal to turn on and turn off the protective system. As a result，leaf growth on the plants scientists used in the study increased. Leaf growth on two plants increased by 20 percent, while leaf growth on a third plant increased by 14percent. Scientists conducted the study on tobacco plants. But they thought the genetic modification would produce the same results in corn or rice.

【小题1】What does the plant's protective system need to keep activated?

A．Mild shade.	B．Leaf growth.
C．Genetic changes.	D．Enough sunlight.

【小题2】What does the underlined word“modification”in Paragraph 4mean?

A．Development.	B．Decoration.
C．Change.	D．Copying.

【小题3】What can we infer from this text?

A．Changing how a plant uses sunlight could mean more food in the future.

B．When the plant is in the shade, its protective system is turned off slowly.

C．Too much sunlight will damage plants' protective system.

D．It is hard for plants to create food without enough sunlight.

   There's a good chance that something you've bought online has been in the hands of a " picker". These are the workers in warehouses (仓库) who pick, pack and ship all those things we ordered.

At Amazon and other companies, they're working side by side with robots. Experts say while the robots are replacing some human workers, the machines aren't quite ready to take over completely.

When a robot finds its storage unit,' it slides underneath, lifts it up and then delivers it to a worker they're called pickers. On a recent day, the computer told a picker to grab what looked like a fantasy board （#t 3#)game. The picker found it, packed it and placed it on the conveyer belt.

"In a traditional fulfillment center where the workers would walk to the different items, it can take hours to fulfill a customer order," Robinson says.

Now, with the help of robots, that task takes minutes and fewer humans.

So is this a sign that we're entering a new industrial revolution?

" It's definitely going to take over a lot of jobs ", says Karen Myers, a scientist at SRI, one of Silicon V alley's oldest research centers.

At the same time, she says, " We're running against the limits of technology. " Take the picker at the Amazon fulfillment center for example. Myers says those skills prove to be uniquely human.

"Our fingers are incredibly flexible and the current generation of robotic operators are getting much, much better," she says. "But they're just not quite there yet."

There's also the robot's brain.

Remember that board game the Amazon worker was looking for? She could barely see the box when it was filled into the storage bin——but she could tell it was a board game. Robots can't do that.

Technologists say that, increasingly, humans will work side by side with robots——instead of robots working alone.

Amazon says robots and humans enabled the Tracy warehouse to fulfill customer orders faster. That means more customers and more human workers.

【小题1】What does a picker do according to the text?

A．Selling goods.	B．Storing goods.
C．Delivering goods.	D．Producing goods.

【小题2】With the help. of robots, the tasks involved will become .

A．more difficult	B．less straight
C．more efficient	D．less profitable

【小题3】Compared with robots, which of the following is the advantage of human beings?

A．Flexible.	B．Artificial.
C．Powerful.	D．Energetic.

【小题4】What would be the best title for the text?

A．Robots replacing humans completely

B．Robots and humans working side by side

C．The future of robots .

D．The advantages of shopping online