You may use banknotes every day. But did you know that there is a lot of science behind the money? {#blank#}1{#/blank#}

    Australia was the first country to use polymer(聚合物）banknotes in 1988. {#blank#}2{#/blank#}

They can stop water from making them wet. They are also cleaner because bacteria don't grow easily on them.

Now, the Australians have improved their banknotes again by creating a new 5-dollar note. The new one has a clear window in the middle in which there are pictures of an Australian bird and a building. {#blank#}3{#/blank#}

    Tilt (倾斜）the note a little and you will see the bird flapping its wings as if trying to fly away. Turn the note from side to side and you will notice the building come to life and spin. While these features are impressive and entertaining, that was not the reason why the Australian Government spent ten years perfecting them. Their primary purpose was to make it impossible to fake a banknote.

    {#blank#}4{#/blank#} The new $ 5 bill now has a raised bump alongside the two long edges, enabling the blind or those with limited vision, to quickly determine its value.

The Australian government will give the new 10-dollar note the same features in a year's time. {#blank#}5{#/blank#}

A. Note makers still have a long way to go.

B. Other notes will have them in the future.

C. The magic of the new features lies in them.

D. They have many advantages over paper notes.

E. The new Australian 5-dollar note is a good example.

F. The new note is also the first touchable Australian banknote.

G. Their material and pattern set them apart from ordinary banknotes.

    In Canada, rights come with responsibilities. These include:

Obeying the law—one of Canada's founding principles is the rule of law. Individuals and governments are regulated by laws and not by arbitrary actions. No person or group is above the law.

    Taking responsibility for oneself and one's family—getting a job, taking care of one's family and working hard in keeping with one's abilities are important Canadian values. Work contributes to personal dignity and self -respect, and to Canada's prosperity.

    Serving on a jury—when called to do so, you are legally required to serve. Serving on a jury is a privilege that makes the justice system work as it depends on impartial juries made up of citizens.

    Voting in elections—the right to vote comes with a responsibility to vote in federal provincial or territorial and local elections.

    Helping others in the community—millions of volunteers freely donate their time to help others without pay -helping people in need assisting at your child's school volunteering at a food bank or other charity, or encouraging newcomers to integrate. Volunteering is an excellent way to gain useful skills and develop friends and contacts.

    Protecting and enjoying our heritage and environment—every citizen has u role to play in avoiding waste and pollution while protecting Canada's natural, cultural and architectural heritage for future generations.

    Through your childhood and, let's be honest, most of your adult life, you may have wondered—how do you get to Sesame Street? After 50 years, the answer has finally been revealed.

    New York City's Official Sesame Street

    In the past, there was guessing about the true location of the street, like Harlem or Alphabet City since both neighborhoods resembled Sesame Street in appearance and population makeup. Recently, in honor of the children's television show's 50th anniversary, New York City Mayor Bill de Blasio declared that West 63rd Street between Central Park West and Broadway will now officially be known as Sesame Street, close to the Sesame Workshop office.

    A Year-long Celebration for the 50^th Anniversary

    Since 1969, the children's television show Sesame Street has been a pioneering force in media and education, dealing with issues like racism, loss, poverty and living with a disability. With a mission to help kids everywhere grow smarter, stronger, and kinder, Sesame Street has brought the life-changing benefits of early learning to children across the globe for 50 years. Today, we reach kids in 150 countries and 70 languages and we're celebrating our landmark anniversary with fans and families all year long!

    Events and Activities Throughout 2019

    Fans and families around the world can join their favorite furry friends in celebrating Sesame Street's past, present, and future, with:

    A 50th television season which focuses on the power of possibilities, empowering kids to take safe risks and learn from their mistakes.

    A nationwide road trip where Sesame Street characters and friends host community events in ten cities around the country.

    A research report that will explore an important issue facing kids and families today.

    Celebrity and fan-fueled social media campaigns showcasing favorite Sesame Street memories.

    New corporations across fashion, lifestyle, and themed entertainment for fans of all ages.

    A November star-studded prime-time special, whose contents include new takes on classic scenes and visits from Sesame Street icons.

    February has long been a month of romance. With the sweet smell of roses in the air, romantic films hit cinemas and love stories fill newspapers and magazines.

    On the 14th day, it is customary for a boy to take his girlfriend out to dinner, buy her flowers and chocolates, write poems, sing to her or even spell out her name with rose petals!

    This is the scene that greets you on Valentine's Day, named after Valentine who was a priest in third century Rome. When the emperor decided that single men made better soldiers than those with wives, he banned marriage.

    But Valentine continued to perform marriage ceremonies for young lovers in secret. When his actions were discovered, the emperor had him put to death.

    While in prison, it is said that Valentine fell in love with the daughter of his prison guard. Before his death, he wrote her a letter, which he signed "From your Valentine", an expression that is still in use today.

    Valentine died for what he believed in and so was made a Saint, as well as becoming one of history's most romantic figures.

    Nowadays, Valentine's Day wins the same popularity among Chinese young people. It is a time when students "don't want to be alone" according to Gao Shunjie, a student reporter for 21st Century Teens in Jinling High School, Nanjing. Some of her classmates are planning to make Valentine's cards for parents, teachers and friends. Others want to hold parties at which they will exchange small gifts and eat heart shaped cakes. The idea is to have fun and encourage people to share in the spirit of St Valentine.

Passenger Information

    Carry-on Bag Rules

    When travelling on China Southern planes, we ask our customers to follow our simple bag rules.

    —Each passenger is allowed to bring one bag onto the plane.

    …Weight limit: Each carry-on bag may weigh up to 10 kilos.

    —Size limit: Each carry-on bag can be up to 110cm long, 60cm high and 30cm wide.

    —Additional bags and oversized/overweight bags may be allowed on the plane if there is enough room. There will be a fee for such bags (see the table below). Please note that if your bag breaks more than one rule then you must pay a fee for each rule broken.

    Safety Rules

    For the safety of our passengers, the following items must not be taken onto the plane:

    —Bottles containing gas (e.g. cigarette lighter)

    —Bottles containing any cream, oil or other liquid that are over 100ml.

Note:

    If you have any liquid medicines over 100ml that you must use during your flight, please contact our customer service manager on 34533566 to make arrangements at least 24 hours before your departure. You will need to have a doctor's letter explaining why you need the medicine.

    Bag Fees

    *No bag over 15 kilos will be allowed on the plane. **No bag over 150cm long or 80cm high may be taken on the plane. Passengers must put such bags in the plane's storage.

    A population of the world's most aggressive mosquito species was almost completely wiped out by an experiment on two islands in the southern Chinese province of Guangdong, according to a study published.

    The experiment successfully reduced the female Asian Tiger Mosquito population — the main source of bites and disease spread — by up to 94%, reducing the number of reported human bites by 97%.

    One of the Chinese study's researchers, Xi Zhiyong, a professor at Michigan State University, has been a longtime pioneer in this field of study. Running a mosquito factory in southern China, he previously attempted to use sterilized male mosquitoes to mate with unaltered females which developed normally. In the new study, published by the International Journal of Science, Xi and his colleagues attempted to cut mosquito numbers even further by limiting both males and females' ability to reproduce. The results were so successful that they nearly killed the entire female mosquito population on the two islands.

    It isn't the first attempt by researchers to reduce mosquito populations across the world. In 2018, scientists from the Imperial College of London used gene-editing tools to make female mosquitoes sterile, while males developed normally and continued spreading the genetic mutation (突变).Experts said the Asian Tiger Mosquitoes are particularly hard to kill using traditional population control methods, such as pesticides (杀虫剂) and removing stagnant (不流动的) water where the insects lay their eggs.

    Mosquitoes create grave threats to human health beyond just bites. The World Health Organization (WHO) has described the insects as "one of the deadliest animals in the world," due to their ability to rapidly spread deadly diseases such as dengue fever and malaria. There is currently no effective vaccine or treatment for most mosquito-spread diseases, leaving controlling the insects' populations one of the most effective control methods, according to the International Journal of Science. “A new tool like what's being described in this paper is very much needed” said Stephen Dobson, a professor of medical insectology at University of Kentucky.