Hello. I'm Jan from Mrs. Lake's class. My class wants to work together to help the public. We think we have found a great way to do this. Last month we did a class project on the highways near our town. We learned about the Adopt-a-Highway Program. This program brings people together to pick up litter along the roads. We think it would be a great idea for all students in our school to join the program and adopt a highway.

    Adopting a highway is not like adopting a pet. When a highway is adopted, only part of the highway is cared for by a group of people. The group agrees to work every week to keep its part of the highway clean. Each group gets its own sign that has the name of the group printed on it. The sign is put up at the side of the road. This sign lets drivers know who is keeping that area of the road clean.

    The Adopt-a-Highway Program is a great way for people to help their environment look nicer. Also, the government does not have to send out as many road workers. This saves money. Finally, people may try harder to keep roads clean if they see people, especially teenagers like us, cleaning them up.

    We will need helpers to care for our adopted highway. If you want to feel great and keep our roads clean，please come with your parents to the meeting next week. We will meet in Mrs. Lake' room on Wednesday at 6:00 P.M. At the meeting, we will talk about which roads are the dirtiest as a result of people's unkind acts. Then we' ll try to pick an area to adopt and clean.

    I look forward to seeing you at the meeting. Remember to keep our roads clean!

    This player is neither the answer to Bafana Bafana's goal-scoring problem, nor holds any hope of being in the national team for the World Cup. But Mmane Koko trains every morning and is now used to playing soccer. She said, 'Before I can do my domestic(家庭的) jobs, I go to train every morning. This helps me keep my body healthy. I started exercising after my doctor told me that exercising can keep my body healthy.'

    Mmane Koko, aged 66, said if she had been exposed to soccer at an earlier age, she would have become a top South African striker and could have stolen the limelight from Noko Matlou, who helped South Africa achieve its best ever result in the African women's soccer cup. She encourages young people to start playing sports early and to continue into their old age as it helps to lower blood pressure and prevent obesity(肥胖症).

    She added that because soccer is not only about exercising, but also helps one to put bread on the table, it could make a difference socially. She also says soccer is a business and that clubs these days pay generously. Therefore if the young take sports seriously, they can make a living out of it. But this can only happen if our government participate in developing sports and building stadiums for future generations.

    Exercise does us a lot of good as Mmane Koko says. We can live longer and feel better through exercise. It gives us energy surprisingly enough! Regular exercise reduces our risk of all kinds of disease. It can help us relieve stress and anxiety, increase our endurance(耐力) and sleep better. Exercise can contribute to our mental well-being and helps treat depression. So if you want to stay fit, keep on exercising to keep your body healthy.

    Scientists have found an unexpected use for virtual reality headsets (耳机). The devices (装置), widely used by computer gamers, show pictures that can be used to test the navigational (导航的) skills of people, who were thought to be at risk of dementia (痴呆). Those who do worse in the tests will be the ones more likely to develop Alzheimer's disease later in life, scientists now believe.

    The discovery that the loss of navigational skills was associated with Alzheimer's was made several years ago by Dennis Chan and his colleagues based at several centers in the UK. These studies used computers to test navigational tasks. But now scientists plan to take their tests to a new level with the use of the virtual reality headsets in which wearers are placed in man-made environments through which they must navigate.

    Around 300 people, aged between 40 and 60, will be arranged to participate in the study. Some will have a gene that puts them at risk of the condition or will come from a family with a history of Alzheimer's. Not all will certainly be affected by the disease, however. Chan's project aims to find out who will. Wearing the headsets, participants will be asked to navigate their way through a series of different environments and then remember the details.

    Researchers recently pointed out the significance of a tiny area of the brain known as the entorhinal cortex (an important memory center in the brain). It acts as a center in a widespread brain network that controls navigation. This now appears to be the first part of the brain that seems to be easily harmed by Alzheimer's.

    The goal of the work is to help people as they develop the disease. "So far, drug trials for Alzheimer's have been applied when people have already got dementia, by which time considerable damage to the brain has already occurred," Chan told the Obsenver. "If we can develop drugs and use them earlier, for example, before the disease has spread beyong the entorhinal cortex, then this would have the potential to prevent the dementia."

    Thanks to this new hands- free suitcase, carrying around heavy luggage may soon become a thing of the past. Designed by Israeli company NUA Robotics, this "smart" suitcase can follow you everywhere you go.

    The carry­on suitcase, now a prototype(雏形), connects to a smartphone app via bluetooth. It has a built­in camera sensor that can "see" you and follow you around on flat floors. It comes with an anti­theft alarm to prevent someone carrying it away when you're not looking. "It can follow and carry things for people around while communicating with their smartphone, and avoiding bumping into other objects," explained Alex Libman, founder of NUA Robotics. "We're combining sensor network, computer vision, and robotics. So if you download our app(应用), press the 'follow me' button, the luggage recognizes its user and knows to follow and communicate."

    NUA is still testing the products and trying to improve features like speed and customization(客户订制), but they hope to make the suitcase available to customers in a year's time. If it proves successful, they want to use the bluetooth pairing technology to automate(自动化操作)lots of other products, like shopping carts at the supermarket. These products are especially meant to be useful to the physically disabled and elderly. "Any object can be smart and robotic," Libman told Mashable. "We want to bring robots into everyday life."

    The Israeli tech company made it clear that the finished product will look just like a common suitcase. They're planning to partner with a carry­on luggage maker, since the product that makes it "smart" weighs just 2.5 pounds and can be fitted on old­fashion luggage.

    With NUA's smart suitcase, carrying around heavy luggage isn't a burden. But how their invention will handle tough blocks like stairs? It will be interesting to wait.

    136 Crestview Circle

    Dover, Connecticut

    January 16, 2015

    Gander's Furniture Store

    Stamford, Connecticut, 09876

    Dear Sir,

    I am writing about your January bill, which I am returning with this letter. I am not going to pay this bill. Last month I bought a table and four chairs for $65.50. They were sent to me on December 18. That night one leg of the table broke while my wife was putting our dinner on it. It fell on one of the chair, and that broke, too. Our $ 2.50 steak landed on the floor, and the dog ate it.

    I spoke to the salesmen who had sold me the table and the chairs. He told me to write you a letter. I wrote you on December 20, saying that I was not going to pay for the furniture. On December 21 some men came and took it back to the store.

    Please do something about your records. I do not want to receive another bill for the furniture which I returned.

Yours truly,

Alberts Robbins

1）简要介绍龙舟队；

2）邀请他加入。

注意：

1）写作词数应为80个左右；

2）请按如下格式在答题卡的相应位置作答。

Dear Allen,

Yours,

Li Hua