Your cell phone holds secrets about you. Besi...

Your cell phone holds secrets about you. Besides the names and numbers that you’ve programmed into it, traces of your DNA remain on it, according to a new study.

DNA is genetic material that appears in every cell. Like your fingerprint, your DNA is unique to you --- unless you have an identical twin. Scientists today usually analyze DNA in blood, saliva(唾液), or hair left behind at the scene of a crime. The results often help detectives identify criminals and their victims.

Meghan J. McFadden, a biologist at McMaster University in Hamilton, Ontario, heard about a crime in which the suspect bled onto a cell phone and later dropped the device. This made her wonder whether traces of DNA remained on cell phones --- even when no blood was involved. To find out, she and a colleague collected flip-style(翻盖式) phones from 10 volunteers. They collected invisible traces of the users from two parts of the phone: the outside, where the user holds it, and the speaker, which is placed at the user’s ear.

The scientists scrubbed(meaning “cleaned”) the phones using a liquid mixture made mostly of alcohol. The aim of washing was to remove all detectable traces of DNA. The owners got their phones back for another week. Then the researchers collected the phones and repeated collecting traces on each phone once more. They discovered DNA that belonged to the phone’s owner on each of the phones.

Surprisingly, DNA showed up even in swabs that were taken immediately after the phones were cleaned. That suggests that washing won’t remove all traces of evidence from a criminal’s cell phone. So cell phones can now be added to the list of clues that can help a crime-scene investigation.

1.McFadden decided to find out whether people leave their DNA on their cell phones when she ____ .

2.The scientists allowed the volunteers to keep their cell phones for a week in order to____.

3.The last paragraph mainly tells us that cell phones ____ .

4.Which of the following is NOT mentioned in the passage?

高二英语阅读理解简单题查看答案及解析

See a cell phone cover that you like on Taobao? Forget about placing an order, paying the bill online and waiting for days for it to be delivered to you. In the near future, you'll be able to get it in minutes just by hitting "print" on your computer.

You might find it hard to believe that you could actually "print" an object like you would a picture. But it is not that hard to understand how it would work. Just as a traditional printer sprays (喷) ink onto paper line by line, modern 3-D printers spread material onto a surface layer by layer, from the bottom to the top, gradually building up a shape.

Instead of ink, the materials the 3-D printer uses are mainly plastic, resin (树脂)and certain metals. The thinner each layer is --- from a millimeter to less than the width of a hair ---  the smoother and finer the object will be.

This may sound like a completely new technology, but the truth is that 3-D printing has been around since the late 1980s. Back then, it was hardly affordable for most people, so few knew about it.

Last year, though, saw a big change in the 3-D printing industry--- printers became much cheaper. For example, 10 years ago a desktop 3-D printer might have cost £20,000 (200,000 yuan), while now they cost only about £ 1,000, according to the BBC.

Taken out of the factory and introduced to more diverse and common uses, 3-D printing can create just about anything you can think of ---flutes (笛子), bikinis, jewelry, aircraft parts and even human organs. In fact, scientists from Cornell University in New York have just made an artificial ear using a 3-D printer, according to Science Daily. The fake ear looks and acts exactly like a natural one.

However, as 3-D printing becomes more common, it may bring about certain problems --- such as piracy(盗版). "Once you can download a coffee maker, or print out a new set of kitchen utensils (餐具) on your personal 3-D printer, who will visit a retail (零售的) store again?" an expert in 3-D printing told Forbes News. Even more frightening, what if anyone in the world could use a 3-D printer to print out a fully functioning gun?

1.According to the article, in the future, the 3-D printing technology will ___.

A．enable people to make better purchases online

B．be applied as widely in our daily lives as computers

C．change the way we make many products

D．shorten the time it takes for people to get what they buy online

2.What was the big event happening in the 3-D printing industry last year?

A．The 3-D printing technology was taken out ofthe factory.

B．The 3-D printer became more affordable forconsumers.

C．The 3-D printer was used for medical treatmentfor the first time.

D．3-D printing technology began to be used invarious fields.

3.How is the last paragraph developed?

A．By analyzing a cause and an effect.          B．By making comparisons.

C．By giving examples.                      D．By presenting research findings.

4.What is the best title of the passage?

A．Printing out everything                   B．Technology in the future

C．Online shopping disappearing              D．Great demand for 3-D printers

高二英语阅读理解中等难度题查看答案及解析

See a cell phone cover that you like on Taobao? Forget about placing an order, paying the bill online and waiting for days for it to be delivered to you. In the near future, you’ll be able to get it in minutes just by hitting "print" on your computer. You might find it hard to believe that you could actually "print" an object as you would a picture. But it is not that hard to understand how it would work. Just as a traditional printer sprays (喷) ink onto paper line by line, modem 3-D printers spread material onto a surface layer by layer, from the bottom to the top, gradually building up a shape.

Instead of ink, the materials the 3-D printer uses are mainly plastic, resin (树脂) and certain metals. The thinner each layer is — from a millimeter to less than the width of a hair —the smoother and finer the object will be. This may sound like a completely new technology, but the truth is that 3-D printing has been around since the late 1980s. Back then, it was barely affordable for most people, so few knew about it.

Last year, though, saw a big change in the 3-D printing industry — printers became much cheaper. For example, 10 years ago a desktop 3-D printer might have cost £20,000, while now they cost only about £ 1,000, according to the BBC. Taken out of the factory and introduced to more diverse and common uses, 3-D printing can create just about anything you can think of --- flutes (笛子), bikinis, jewelry, aircraft parts and even human organs. In fact, scientists from Cornell University in New York have just made an artificial ear using a 3-D printer, according to Science Daily. The fake ear looks and acts exactly like a natural one.

However, as 3-D printing becomes more common, it may bring about certain problems —such as piracy. "Once you can download a coffee maker, or print out a new set of kitchen utensils (餐具) on your personal 3-D printer, who will visit a retail (零售的) store again?", an expert in 3-D printing told Forbes News. Even more frightening, what if anyone in the world could use a 3-D printer to print out a fully functioning gun?

1.According to the article, in the future, the 3-D printing technology will 　　　　 .

A. enable people to make better purchases online

B. change the way we make many products i

C. be applied as widely in our daily lives as computers

D. shorten the time it takes for people to get what they buy online

2.What happened in the 3D printing industry last year?

A. The 3-D printing technology was taken out of the factory.

B. The 3-D printer was used for medical treatment for the first time.

C. The 3-D printer became more affordable for consumers.

D. 3-D printing technology began to be used in various fields.

3.How is the last paragraph developed?

A. By giving examples.

B. By making comparisons.

C. By analyzing the cause and effect.

D. By using figures.

4.What is the best title of the passage?

A. Online Shopping Disappearing

B. Technology in the Future

C. Printing out Everything

D. Great Demand for 3-D Printers

高二英语阅读理解中等难度题查看答案及解析

Cell Phones Are the New Cigarettes

When you get in your car, you reach for it．When you’re at work, you take a break to have a moment alone with it．When you get into a lift, you play with it．

Cigarettes? Cup of coffee? No, it’s the third most addictive thing in modern life, the cell phone．And experts say it is becoming more difficult for many people to curbtheir longing to hug  it more tightly than most of their personal relationships．

With its shiny surface, its smooth and satisfying touch, its air of complexity, the cell phone  connects us to the world even as it disconnects us from people three feet away．In just the past  couple of years, the cell phone has challenged individuals, employers, phone makers and  counselors（顾问）in ways its inventors in the late 1940s never imagined．

The costs are becoming even more evident, and I don’t mean just the monthly bill．Dr．Chris  Knippers, a counselor at the Betty Ford Center in Southern California, reports that the overuse of  cell phones has become a social problem not much different from other harmful addictions: a barrier to one-on-one personal contact, and an escape from reality．

Sounds extreme, but we’ve all witnessed the evidence: The person at a restaurant who talks on the phone through an entire meal, ignoring his kids around the table; the woman who talks on the phone in the car, ignoring her husband; the teen who texts messages all the way home from school, avoiding contact with kids all around him．

Is it just rude, or is it a kind of unhealthiness? And pardon me, but how is this improving the quality of life?

Jim Williams, an industrial sociologist based in Massachusetts, notes that cell-phone addiction is part of a set of symptoms in a widening gulf of personal separation．He points to a study by Duke University researchers that found one-quarter of Americans say they have no one to discuss their most important personal business with．Despite the growing use of phones, e-mail and instant messaging, in other words, Williams says studies show that we don’t have as many friends as our parents. “Just as more information has led to less wisdom, more acquaintances via the Internet and cell phones have produced fewer friends,” he says．

If the cell phone has truly had these effects, it’s because it has become very widespread．Consider that in 1987, there were only 1 million cell phones in use．Today, something like 300 million Americans carry them．They far outnumber wired phones in the United States．

1.Which of the following best explains the title of the passage?

A．Cell phone users smoke less than they used to．

B．Cell phones have become as addictive as cigarettes．

C．More people use cell phones than smoke cigarettes．

D．Using cell phone is just as cool as smoking cigarettes．

2.The underlined word “curb” in Paragraph 2 means ____．

A．rescue           B．ignore            C．develop           D．control

3.The example of a woman talking on the phone in the car supports the idea that ________．

A．women use cell phones more often than men

B．talking on the phone while driving is dangerous

C．cell phones do not necessarily bring people together

D．cell phones make one-on-one personal contact easy

高二英语阅读理解中等难度题查看答案及解析

Cell phones are so cheap that almost all people can afford it. _____ you go, you can see people holding cell phones doing different things. Our life style has changed greatly _____ of the widespread of mobile phones.

Mobile phones change _____ way we contact others. In the past, we contacted our families, relatives and friends by writing letters _____ just going to a certain area to make a phone call. Now, if we want to contact them, all we need to do is to take out our cell phone, dial the number and then we can reach _____ in a minute.

With a cell phone, we _____ take photos and locate ourselves easily. All cell phones have a camera function. We can take photos anywhere we want and do _____ need to take our camera. Besides, _____ we are lost, we can use a cell phone to locate ourselves and find the right direction.

高二英语其他题中等难度题查看答案及解析

Teenagers who talk on the cell phone a lot, and hold their phones up to their right ears, score worse on one type of memory test. That’s the finding of a new study. That memory impairment might be one side effect of the radiation (放射线) that phones use to keep us connected while we’re on the go.

Nearly 700 Swiss teens took part in a test of figural memory. This type helps us remember abstract (抽象的) symbols and shapes, explains Milena Foerster. The teens took memory tests twice, one year apart. Each time, they had one minute to remember 13 pairs of abstract shapes. Then they were shown one item from each pair and asked to match it with one of the five choices. The study volunteers also took a test of verbal memory. That’s the ability to remember words. The two memory tests are part of an intelligence test. The researchers also surveyed the teens on how they use cell phones. And they got call records from phone companies. The researchers used those records to figure out how long the teens were using their phones. This allowed the researchers to work out how big a radiation exposure (接触) each person could have got while talking.

A phone user’s exposure to the radiation can differ widely. Some teens talk on their phones more than others. People also hold their phones differently. If the phone is close to the ear, more radiation may enter the body, Foerster notes. Even the type of network signal that a phone uses can matter. Much of Switzerland was using an older “second-generation” type of cell phone networks, the study reports. Many phone carriers (通讯公司) have moved away from such networks. And more companies plan to update their networks within the next few years.

The teens’ scores in the figural memory tests were roughly the same from one year to the next. But those who normally held their phones near the right ears, and who were also exposed to higher levels of radiation, scored a little bit worse after a year. No group of teens showed big changes on the verbal memory test. Why might one type of memory be linked to cell phone use, but not another? Foerster thinks it could have to do with where different memory centers sit in the brain. The site that deals with the ability to remember shapes is near the right ear.

1.According to Paragraph 2, which of the following is TRUE?

A.The teens took two types of memory tests four times in total.

B.The teens needed to report the average time spent on their phones.

C.Researchers paid little attention to the teens’ habits of using phones.

D.The teens’ ability of remembering words is shown in figural memory test.

2.What can we infer from Paragraph 3?

A.How people hold their phones has no effect on their bodies.

B.Phone users can make more money with new networks.

C.The cell phone network type has little to do the cell phone use.

D.Radiation levels are affected by the cell phone network types.

3.According to the study, teens who use their phones to their right ears a lot do worse in ________.

A.matching numbers B.reading signals

C.remembering shapes D.learning words

4.What might be the best title for the text?

A.Cell phone use and safety warnings

B.Facts about cell phone use at school

C.Dangerous levels of cell phone use among teens

D.Teen’s cell phone use linked to memory problems

高二英语阅读理解中等难度题查看答案及解析

Many of us enjoy doing it: you turn on the camera on your mobile phone and hold it at a high angle, making your eyes look bigger and your cheek­bones more defined. You turn to your best side and click. There it is — your selfie.

Over the past year, “selfie” has become a well-known term across the globe. This August the Oxford diction­ary added the word to their online dic­tionary and defined it as: “A photograph that one has taken of oneself, typically with a smartphone or webcam and up-loaded to a social media website.”

Today it’s not difficult to find social networking pages full of photos people have taken of themselves and their friends. And selfie culture has become especially relevant for young people. As many as 91 percent of teenagers have posted photos of themselves online, according to a recent survey by the US Pew Research Center.

So what are the reasons for the rise of selfie culture?

“The cult (狂热) of the selfie celebrates regular people,” Pamela Rutledge, a profes­sor at the Massachusetts School of Professional Psychology, told Vogue magazine. “There are many more photo­graphs available now of real people than models.”

Posting selfies also allows you to control your image online. “I like having the power to choose how I look, even if I’m making a funny face,” Samantha Barks, 19, a high school student in the US, told Vogue.

In addition to self-expression and documentation, selfies “allow of a close friendship for long­-distance friends, because you can see each other’s faces every day”, wrote Casey Miller at The Huffmgton Post.

But US psychologist Jill Weber is concerned that selfies might lead to social problems, “There’s a danger that your self-esteem may start to be tied to the comments and ‘likes’ you get when you post a selfie, and they aren’t based on who you are — they’re based on what you look like,” Weber told Vogue. “When you get nothing or a negative response, your confidence can plummet.”

1.With the first paragraph, the author intends to 　　　　　 .

A. tell us the fun of taking a selfie

B. describe what a selfie is

C. introduce where the selfie came from

D. inform readers that the selfie is popular among teenagers

2.Why is selfie culture so popular according to the article?

a. It enables people to choose how they look.

b. It helps people improve their self-esteem.

c. It’s a chance for ordinary people to show off themselves.

d. It is believed to be a helpful way to develop a new friendship.

e. It is considered a good way to stay connected with friends that are far away.

A. a, c, e　　 B. b, c, d　 　　 C. a, b, c　 　　 D. b, d, e

3.What is Jill Weber’s attitude toward selfies?

A. She thinks they are a good form of self-expression and documentation.

B. She believes the disadvantages of selfies outweigh the advantages.

C. She is worried that people’s self-esteem might be affected by how others react to their selfies.

D. She thinks that selfies can help people learn about their friends based on who they really are.

4.The underlined word “plummet” in the last paragraph probably means 　　　　　 .

A. rapidly develop　 　　　　 B. greatly exaggerate　　

C. become dangerous　 　　 D. quickly fall

高二英语阅读理解中等难度题查看答案及解析

Cell phones：Is there a cancer link?

Could your cell phone give you cancer? Whether it could or not, some people are worrying about the possibility that phones, power lines and Wi-Fi could be responsible for a range of illnesses, from rashes to brain tumors.

Some say there is evidence to support the growing anxieties. David Carpenter, a professor of environmental health sciences at the university at Albany, in New York, thinks there’s a greater than 95 percent chance that power lines can cause childhood leukemia (白血病). Also there’s a greater than 90 percent chance that cell phones can cause brain tumors. “It’s apparent now that there’s a real risk, ”said Carpenter.

But others believe these concerns are not justified. Dr Martha Linet, head of radiation epidemiology (流行病学) at the US National Cancer Institute, has looked at the same research as Carpenter but has reached a different conclusion. “I don’t support warning labels for cell phones, ”said Linet. “We don’t have the evidence that there’s much danger.”

Studies so far suggest a weak connection between EMFs (电磁场) and illness—so weak that it might not exist at all. A multinational investigation of cell phones and brain cancer, in 13 countries outside the US, has been underway for several years. It’s funded in part by the European Union, in part by a cell phone industry group. The final report should come out later this year, but data so far don’t suggest a strong link between cell phone use and cancer risk.

1.From the passage we can learn that some people are worried because________.

A. they have evidence that the use of cell phones can lead to cancer

B. they feel surprised and alarmed about cell phone use

C. some experts have given a warning

D. cell phones are responsible for brain tumors

2.By saying “I don’t support warning labels for cell phones, ”Dr Martha Linet has the idea that_______.

A. the worrying is unnecessary

B. cancer—warning labels should be on cell phones

C. there is a link between cell phones and cancer

D. cell phones have nothing to do with cancer

3.Which of the following best describes the attitude of the author towards the debate?

A. Optimistic.　　 B. Objective.

C. Opposite.　　 D. Casual.

4.The underlined word “justified” in Paragraph 3 is closest in meaning to_____．

A. explained　　 B. confirmed （证实、确认）

C. classified　　 D. restricted （限制）

高二英语阅读理解中等难度题查看答案及解析

You’re finishing up your history homework when your cell phone rings. You’ve got 30 minutes to reach head-quarters, get your equipment packed and receive your task. There’s a lost hiker in the mountains near the edge of town. Your task: find the missing person; provide emergency medical treatment, if necessary; and be prepared to operate 48 hours on your own with only the supplies you carry.

Sounds like some kind of film’s plot? Not if you’re a member of the Arapahoe teen rescue patrol in the suburbs of Denver. About 25 teen guys and girls are active members of this search, rescue and emergency organization, and they know firsthand that you don’t have to be an adult to save lives.

These 9th-through-12th graders are the real deal when it comes to emergency services. In fact, they’re the only teen-commanded patrol in the nation. Sure they have adult advisers to turn to if necessary, but in the field it’s a teen patrol officer calling the shots — sometimes even giving direction to adults.

Members are trained in rock-high-angle，swift-water and avalanche rescue (雪崩施行营救), winter and alpine operation , wilderness life support and emergency care, among other skills. They also regularly ride along with the local fire and police departments, providing support such as security details and evidence searching.

When asked what qualities make a good patrol member, founder and president Stan Bush named good physical conditioning and an interest in helping people. “We put in lots and lots of hours helping people in trouble,” he says. “So if a person is not really interested in doing that kind of thing, he won’t last as a member.”

1.In the first paragraph, the author describes ______.

A. a plot in some kind of film                                 B. a teen patrol member’s life

C. an emergency rescue                                                  D. a lost hiker in trouble

2.Which of the following is NOT true about the Arapahoe teen rescue patrol?

A. They are trained to have many special skills.

B. They also work with local firemen and policemen.

C. They turn to adults for help sometimes.

D. They think they can save lives only when growing up.

3.If you want to become a good rescue patrol member, you must ______.

A. be strong and interested in offering help

B. be a 9th-through-12th grader

C. finish your history homework first

D. spend many hours helping people first

4.What would be the best title for the passage?

A. What qualities make a good patrol member?

B. The Arapahoe teen rescue patrol

C. How to become a rescue patrol member

D. Skills a rescue patrol member needs

高二英语阅读理解中等难度题查看答案及解析

Since you have had your cell phone _____ , you don’t need to borrow mine.

A. repairing         B. to repair          C. repaired               D. repair

高二英语单项填空中等难度题查看答案及解析