A smile will tell people around you that you are a kind and friendly person. However,many people don't smile because they think they ugly teeth. For example, one of my classmates, Mile, doesn't have very nice teeth,so thatis why he seldom opens his mouth.he even says that he has lost cofidence because of his teeth.So it is very important for us to look after our teeth. In fact, a lot of people have this problem. Some people inherit teeth problems from their parents,while others'teeth are damaged because of bad habits,like heavy smoking,eating too much sugar or not brush-ing teeth often.If your teeth are in bad shape, you should see a dentist and ask for help. They can help improve your teeth and tell you how to take care of then.
   Smiling can help you to feel more confident and make other people think of you as a more friendly person. If you want to keephealthy, you should not only smile but also laugh. An Indian doctor called Kataria said that young children should laugh about 300 times a day, wile adults should laugh between 7 and 15 times a day. So please take this chance to smile and laugh now!

Soon computers and other machines will be able to remember you by looking at your eyes! The programme works because everyone's eyes are different. So in the future you won't have to remember a number when you want to use a machine or take money out of a bank. You'll just have to look at the machine and it will be able to tell who you are.
The eye-recognition programme is already being tested in shops and banks in the USA, Britain, Spain, Italy and Turkey. Soon, this technology will take the place of all other ways of finding out who people are.
However, scientists are working on other systems. Machines will soon be able to know you from the shape of your face or hand or even your smell! We already have machines that can tell who you are from your voice or the mark made by your finger.
Eye-recognition is better than other kinds because your eyes don't change as you get older, or get dirty like hands or fingers. And even twins have different eyes, so the programme can be up to 94％ correct, depending on how good the technology is. Some programmes may only be right  51％ of the time. In Britain, it was found that 91％ of people who had tried it said that they liked the idea of eye-recognition. In the future your computer will be looking you in the eye. So smile!

    It is a question that has confused parents for many years: why do children refuse to eat greens?

    Now, two American experts believe they have the answer.

    After studying dozens of babies as they played with various objects, the researchers noted that they were far more unwilling to touch plants than other things. They believe this is because evolution (生物进化) has biologically made children be wary of plants.

    Due to susceptibility (敏感性) to illness or injury in the early years of life, the body has designed an inner defence mechanism (内部保护机制) that limits a child' s contact with plants, they think. The researchers believe this is why children turn their noses up when faced with a plate of broad beans.

    The findings are published in a paper by Dr Annie E Wertz and Dr Karen Wynn, both psychologists at Yale University.

    They wrote, "Throughout human evolution... plants have been important in human's life. Yet, for all of these benefits, plants have always caused very real dangers."

    "Plants produce toxins (毒素) as defences that can be harmful, or even deadly. Some plants also produce physical defences, such as thorns（荆棘）can damage tissues (组织) and cause effects over the whole body."

    They added, "We predicted that babies may have behavioural strategies that reduce dangers caused by plants."

    To test their theory, the researchers studied how children aged eight to 18 months old reacted when presented with a variety of objects. It took much longer for children to grab plants; objects that were pretended to look like plants also caused a slow response time.

    For parents attempting to spoon some peas into the mouth of their child, this finding should come as welcome relief.

    The biggest influence that technology has on family time is the change of it. People used to spend more time with their family members before. Nowadays, with children (and the parents, too) spending more time texting, watching movies and television, playing video games, and listening to music, when will the family find time to bond (培养感情) and create lasting memories together?

    Far too often we don't pay more attention to making time for members of our own family. By the end of a long day at work or school, members of the family want to relax. And now that technology use is widespread across the country, normally our "relaxing" is also known as spending time on smart phones.

    Not only is the amount of family time affected (影响) by technology, but also the quality. Technology can affect the quality in different ways. For example, family members can be distracted (使分心) by their phones while trying to play a board game together, which wouldn't  have happened if the phone didn't exist in the first place.

    If "family time" means everyone sitting in the same room while playing online, what value is there? Personal interaction is key to time well spent with loved ones. Families don't even need to have something to do while together. If they simply ask each other how their day is and play a simple game together, family bonds will get better.

    When technology becomes a focus, quality(有质量的) time for families goes down, which in turn affects everyone's life. Lack of family interaction causes the family's unity to weaken, and each of the family will be influenced in different ways. Children are more likely to develop unhealthy habits when they fail to interact with their parents. Meanwhile, parents who put work before family or pay less attention to their children's growth are more likely to face bad parent-child relationship. 67 percent of American teens say they want to spend more time with their parents, which is rather sad. Therefore, this passage is meant to show how technology has negatively influenced families.

It is natural for young people to admire cool young "idols（偶像）". We spend a lot of time on them — even {#blank#}1{#/blank#} time than we spend on our studies or work. We often wonder what we could do {#blank#}2{#/blank#} cool like them. 

Well, guess what? Many of your idols {#blank#}3{#/blank#} to "look" cool. If you could see into their private lives, you would find these stars aren't so bright. Some of {#blank#}4{#/blank#} might not be as honest, kind or hard-working as you are!

When I was a teenager, I admired pop idols, too. Then, one day, I discovered Leonard Cohen and Neil Young. They were very common people {#blank#}5{#/blank#} played the guitar. They wore no special clothes, and they had no crazy fans. They didn't need to be special because their songs were great and meaningful. They told the {#blank#}6{#/blank#}: Life is hard and the road you take might sometimes be lonely. They taught me that it was okay if I was not popular and cool all of the time. I still listen to them today. 

Modern "idol culture" often {#blank#}7{#/blank#} the wrong message that life is always easy and fun. But the best actors, the most {#blank#}8{#/blank#} sports stars and the most creative scientists all face many difficulties. 

Idols can serve as important role {#blank#}9{#/blank#} in our lives, so it's very important to choose the right ones. We should admire people who teach us important values that can guide us on the right road. That's what we {#blank#}10{#/blank#} need. The next time you see some pretty, popular "stars", ask yourself: Do I really need these people in my life?