A student walks into his first class and realizes he forgot all about the midterm exam. He knows he needs to bring his grades up, and getting a zero will make it nearly impossible. He quickly jots down some notes and shoves them under his lap hoping it will help him pass. Cheating is a major concern in all academic environments. Students are creating new and more outrageous(令人吃惊的）ways of cheating every day: some claim that certain accounts of cheating can be justified, but overall it can always be prevented.

    Cheating has been around forever, and millions of ways to cheat have been fashioned. Copying homework and cheat sheets are some of the most basic ways students in all education levels have cheated. Some students think nothing about writing a few answers on their hand, in a gum wrapper, or boldly using a study guide to cheat. Desperate students have even gone as far as to steal the test or scan in bottle wrappers and put answers into the nutrition label. The internet has now become available in almost every location. Computers can be accessed at school, at home, and now even on cell phones. This opens a doorway for even more methods of cheating to be born.

    There are countless opinions on whether or not cheating can be justified. The truth is this behavior will always be a matter of opinion with each scenario of cheating. Students often rationalize their cheating by claiming they forgot to look over the material or did not understand what the teacher or professor was saying. Some may counter these arguments by saying that the student could have set reminders or asked the teacher to explain the material before the day of the test. Some other reasons students believe cheating is justified are their heavy workloads and trying to find time for school, sports, friends, and family. This may be true in certain instances, however, all students have these problems, and it is unfair to the students refrain(制止) from cheating when the student who is dishonest receives a better grade. The majority of students who think cheating is acceptable may believe the reason for this is that sometimes students are unaware they are cheating, there is not enough time given for assignments, or that the information is too much for the course.

    It may be difficult to accomplish, hut cheating can be prevented. 1'eachers and professors have tried many options to stop cheating. These options can range anywhere from simply spreading test-takers out in a room, to expelling（驱逐）a student, which will most likely hinder their plans of getting into another college. One simple way to fix the problem is to scold the student when caught. They may be so scared or embarrassed that they never do it again. This is a risky way to prevent cheating in some cases, however, because it can possibly damage self-esteem. Another simple way 10 avoid cheating is to create many different kinds of the same test. This prohibits students from getting the answers off of a neighbor's test, but students still have the option of using other cheating tactics.

    There may be a million ways to cheat and get away with it, but there are few times, if any, that it is justified. Cheating never has to be a necessity and is never worth compromising morals and losing years worth of working towards a degree. This problem is spreading throughout America; with everyone's help, it can be stopped.

A Blessed Teacher

    I remembered Ricky came back to see me ten years after he was in my class. He told me how I had inadvertently(不经意地) changed his life.

    Ricky often gazed out the window during one of my ninth-grade history classes early in my teaching career. He was quiet, and his good grades and mild manner were why I did not move him away from the seat by the window.

    One day, I leaned over his shoulder and quietly asked, “What are you looking at? You gaze out of this window during every class.”

    He said, “I am looking at the band.”

    According to Ricky, I said, “If you like the band so much that you have to look at them during this class every day, I want you to go down to Mr. Overby (the band teacher) and tell him that I sent you. Tell him that you want to be in the band. Now turn around and finish working before the bell rings.”

    The next day Ricky went to Mr. Overby and told him I had sent him and he wanted to be in the band. He added that he did not know how to play any instrument.

    When Ricky visited me ten years later, he thanked me for telling him to go to Mr. Over by because he fell in love with music and discovered his musical talent that had not been tapped. His musical talent resulted in him getting a scholarship to college and earning a degree that now allowed him to provide for his family. Most of all, music had brought great pleasure and satisfaction to his life.

    After Ricky thanked me, I pointed out that he did all of the hard work it took to become the wonderfully talented person that he was. I did not make him walk downstairs to join the band, practice his instrument, and get the good grades that led to his college scholarship.

    Ricky responded that I could have yelled at him for looking out the window. Instead, I gave him an alternative that changed his whole life.

    After he left, I thought about his words. I realized that I was teaching children with every word I said, every action I took, and with every decision I made. Ricky's story raised my teaching bar. Most of all, I have never forgotten the lesson Ricky taught me, a blessed teacher.

    Mexico sites on an island plateau (高原) surrounded by volcanic peaks, which makes air quality a constant concern for people who live there.

    In April, the country took a decisive step toward improving air quality by enacting a temporary ban on private and Federal vehicles in the city. The rule forbids people from driving in the city one day each week and one Saturday each month. Electric vehicles, government service vehicles, public transport options and school buses are not included in the ban.

    Mexico City isn't the first urban center to be involved in car-free living. But the ban is more than an awareness-raiser. It was enacted with the direct aim of solving air pollution. In March, the city sank into a deep brown haze of smog when the pollution levels passed the 200 mark. The city ordered some 1.1m of the area's 4.7m cars off the streets and also offered free bus and subway rides.

    Mexico City's temporary vehicle ban raises questions about the best ways to improve urban air quality. India, whose citizens breathe some of the world's dirtiest air, has tried a variety of solutions. Earlier this year, the Indian government started a 4% sales tax on new-car purchases.

    Beijing also has experience with cleaning the air. The city introduced alternate-day rules in advance of the 2008 Olympic Games, which produced good results. And then there is the London congestion (拥挤) charge, introduced in 2003. The charge has had a measurable effect on air quality.

For now, Mexico City — named by the United Nations as the most polluted city on the planet in 1992 — can look forward to the start of the region's rainy season, when daily showers will help lo clean the air.

    Dogs are our best friends. That's especially true after a disaster, such as an earthquake. When buildings fall down, search and rescue dogs help find trapped people. Dogs' amazing noses can pick up the smell of survivors. Now scientists have developed an electronic tool that does the same thing. It's taking smell detection(探测) to a whole new level.

    The new invention is a sort of electronic nose, which can detect extremely low levels of many compounds(化合物) from people's skin. This isn't the first time engineers have developed such an object. Earlier models, however, have been bulky and expensive. They could not detect low levels of target compounds either. The new one is inexpensive and small enough to fit inside hand-held equipment.

    The electronic nose can detect extremely slight smell of more than one compound at the same time. "Being able to do this, in such a small object, is the significant discovery," says Sotiris E. Pratsinis, Professor of Process Engineering&Materials Science at the Swiss Federal Institute of Technology in Zurich. His team tested it in special spaces. They were like the small spaces where people might be trapped. Chemicals given off by the volunteers built up inside. The electronic equipment detected those compounds at unbelievably low levels.

The results were good news for the research team. But they may be not for our four-legged friends, who could soon be out of a job. "Ideally, this technology could replace search and rescue dogs," Pratsinis says.

    Stephen Taylor, an electrical engineer, agrees that the new technology has some benefits over dogs. Still, he thinks it may be too soon to have our trusty friends retire. He suspects, "I foresee that such an object could add to the fine work done by the dogs." Taylor also pointed out some potential limitations of the new invention. "E-noses are useful, but can be very likely to be affected by unstable readings and interruption," he says.

    A retired United States soldier named Terry McGlade, who had served in Iraq and Afghanistan, his dog Major is a hero. He is specially trained to says sense when McGlade is about to have a seizure, get his phone and dial 911 for help.

    When Major had recently sensed an incident about to happen, and McGlade collapsed and hit the floor, Major was able to get to McGlade's phone, and more or less bite on the phone which is specially set up so that when multiple buttons are pressed and held in, it goes into emergency call mode, and dial 911.

    "He was actually able to get my phone out of my pocket," McGlade said.

    The 911 operators who got the call from Major said they never heard him bark or anything. However, they could hear what sounded like a confused man in the background, and did get quite suspicious after quite a few calls from McGlade's cell phone kept coming in. Quite clearly, Major was using his leg and also stepping on the screen to get the phone to díal for help.

    After Major was sure someone would be on their way to help, he then made his way out to the front of the house to wait. When police and ambulance arrived, he led them into the house and right to McGlade, still in distress.

    "I probably would have been in severe trouble if he wouldn't have called," McGlade said.

    McGlade was taken to the hospital, where he was kept overnight for observation, but thanks to his best friend, and now hero of the day, Major. He is feeling much better, and will make a full recovery with little risk of lasting damage from this particular incident.

4-Day Classic Beijing Tour

    The 4-day classic Beijing tour is designed for tourists who come to visit China for the first time. It covers the most popular and typical places in Beijing, fully displaying the scenery, culture, history, local lifestyles and features, food and drinks, business, etc. for you.

Day 1: Arrival in Beijing

    Your guide meets you at Capital Airport, and helps you check in at your hotel

    Enjoy Beijing Duck as welcome dinner.

    Accommodation: Beijing downtown

Day 2: The Great Wall & the Summer Palace

    Start your day at the most famous part of the Great Wall, the Badaling Great Wall. Leave the downtown for the Great Wall at 8 am. Since it is a long drive to the Great Wall (about 2 hours' riding) have a break at the Jade Museum on the way. Lunch will be enjoyed in a local restaurant. In the early afternoon come back to the city and have a sightseeing tour of the Summer Palace.

    Recommended Activity: Beijing Opera Show (Liyuan Theatre, 19:30-21:10 every evening)

    Accommodation: Beijing downtown

Day 3: Beijing city sightseeing & Local experience

    Your guide meets you at the hotel at 8 am and set out for the day's touring: Tian'anmen Square and the Forbidden City.

    After visiting the two sites, have a break and get ready for lunch.

    Hutong visit: see some traditional arts of the old Beijing, such as paper cutting and kite making, and visit a local family.

    Accommodation: Beijing downtown

Day 4: Beijing Olympic sites

    Visit the Olympic sites: Bird's Nest, Water Cube and Olympic Park, witnessing the fast developing modern China. Enjoy some free time after visiting the sites.

    After lunch, it is shopping time and then the tour is over.