Our life has become easier and more colorful because of mobile phones and the Internet. However, a number of worrying problems have come along with them.

Many car accidents are caused by mobile phones. Some drivers use mobile phones to get on the Internet while driving. Looking at their mobile phones and not at the road, these drivers have become a danger to us all.

Many of the dangers of the Internet are well known. Children who visit websites without their parents‘' permission sometimes talk to elder people they don't know and put themselves in great danger. People with blogs sometimes post information of people they don't know on their websites without permission. Some people even use the Internet to get personal information that we do not want them to have.

    Mobile phone and the Internet safety tips：

Use a ‘hands-free' phone if you need to use a mobile phone when you drive.

     In difficult driving situations such as in rain or snow, do not use your phone at all.

     Do not make very important phone calls while driving. They take your attention (注意力) off the road.

     Tell your children not to talk with anyone they do not know on the Internet.

     In an embarrassing situation (尴尬场合), be careful with people around you.

Don't give out any personal information on the Internet.

No. 4 Middle School

Kunming, Yunnan

April 2nd, 2014

Dear Editor,

I live in a beautiful city. Many visitors come to my city. There are so many colorful peacocks (孔雀)here.

    The peacocks mostly (主要）live on the grassland of Dongfeng Square. Visitors can give them food freely. They usually throw food to them, and don't think about at all whether the food is right or not. Some of the peacocks became ill. Some even died after eating the bad food.

    I'm sure most of the visitors who throw food to the peacocks really like the birds, but they don't realize that they may be doing any harm.

    We should tell the visitors that what they have done is very harmful to the birds, and we also must stop this kind of thing from happening.

    Perhaps we can build some small shops beside Dongfeng Square to sell peacock food. For every one of us, it's our duty to give more love to these beautiful birds and to look after them carefully.

Yours,

Sun Yan

    Five hundred years ago, potatoes grew in South America. They were an important food for the people who lived in these high mountains. In other parts of the world, however, people didn't know about potatoes.

    The Spanish came to South America in the 1500s. They learned of potatoes and took some back to Spain. By 1570, people grew white potatoes in parts of Spain. By 1580, people in Italy were also growing potatoes.

    From Spain, potatoes travelled to France. In France, however, people were afraid to eat this new vegetable. They thought it was bad for health. Then the King of France tried to make his people eat potatoes. But for many years, the French still refused to eat potatoes.

    Potatoes reached England in a different way. In 1586, the English explorer(探险家) Drake stopped in Colombia. There he probably picked up some potatoes and took them back to England. At first, the English refused to eat potatoes, too. They used potatoes to feed their pigs and chickens.

    From England, the potato travelled to Ireland. The potato grew well in the poor soil of Ireland and soon it was an important food for the people in Ireland.

    In the early 1700s, Irish people brought potatoes to North America. By 1750, many people in New England were growing and eating potatoes.

    Have you ever seen a car without a driver? It sounds crazy, but these computer-driven driverless cars will soon be filling roads near you. Companies like Google and Tesla have been designing and testing these cars, and the technology is there.

    So how? The cars have sensors（感应器）all around which can find other cars and objects in the road. Road signs are read by cameras, and satellite navigation systems（卫星导航系统）are used so the car knows how to get where you want to go. All you have to do is type in the address! Finally, a central computer system takes in all the information that it receives from the sensors and cameras and works out when to speed up, stop and turn.

    Sound like your idea of heaven（天堂）? Sitting back, looking out of the windows and even watching a film or reading a book while ‘driving' would be possible with this new technology. You wouldn't have to worry about remembering directions to where you're going. In addition, computers would also drive more safely than people — they would obey the rules and have quicker action times when in dangerous situations.

However, there are many drawbacks of driverless cars. Computers would have difficulties making ethical（道德的）decisions: if a child ran into the road, would the computer choose to hit the child or turn suddenly and potentially kill the car's passengers? Moreover, I personally find driving fun –I'd miss never driving a car myself. There would also be many other decisions to be made –should children, or drunk people, be allowed in a driverless car by themselves? Or would there need to be a person with a driving license in the car at all times?

    I'm not certain I'd want a driverless car – but it's only a matter of time before they'll become more affordable and popular on our roads.