The Internet nowadays opens a wide world to people, including teenagers, but many parents worry that their children may meet with something unhealthy when searching online. In order to solve this problem, a new search engine for children called Kiddle has appeared.

    Search results are filtered（过滤）,so only safe website are shown and descriptions are written in simple language. Searches with bad words are shut off, too.

    Kiddles uses the same colors as Google in its logo and a similar design on its homepage, too—with an extra robot picture.

    The top three Kiddle search results show safe websites and pages written specially for kids, and those websites and pages are well chosen and checked by Kiddle developers.

    The fourth to seventh results will be safe and trusted websites that are not written specially for kids, but have content written in a simple way. These results are also chosen and checked.

    Results on the eighth and owwards pages are safe and famous websites that are written for adults. They provide expert content, but are harder for kids to understand.

    Unlike on Google, most results appear along with large thumbnail pictures（缩略图）to make it easier for children to find what they are looking for. For example, when searching for "meow meow". Google produces pages for information about a drug（毒品）that has "meow meow" as its nickname（绰号）,but Kiddle lists information only about cats, even with some cartoon pictures.

    The company explained, "Websites which appear in Kiddle search results satisfy family-friendly requirements, as we filter websites with unhealthy content."

    Please look at my family photo.

    Those are my grandparents. These are my parents. My mother is Mona. She likes red. She likes hamburgers for breakfast. And she often plays ping—pong. That is my brother. His name is Jack. He doesn't like red. He just likes yellow. He often has milk and bread for breakfast and then plays soccer. Now this is me. my name is Tony. I like blue very much. My sweaters, my T—shirts, my pants, my shoes are all blue. For my breakfast, I like eggs. I don't like soccer. It's so boring. I just like tennis. It's so fun. This is my family. I love my family.

    While you are at the bookstore, you may be faced with a difficult decision: e­ books or paper books? Each one has its advantages and disadvantages. Making the best decision depends on a number of factors(因素).

    An e­ reader can carry a whole library wherever you go, which is great for travelers or those who always want a choice of reading materials. Although e­ readers are convenient, high levels of screen brightness from an electronic device(电子设备) can cause eye problems. A study in the Information Science Research found that young people preferred e­ readers, like smart phones or iPads. That's why most teenagers are short­sighted.

    Many book lovers prefer paper books and value the feeling of them. Paper books are very well designed, they look and smell good, and they carry with them a more human touch. Avid(热衷的) readers prefer reading on paper .Perhaps this is their choice because paper books give them a sense of ownership .It is reported that reading on paper rather than an electronic screen is better for memory and focus .But paper books are heavy and they are not convenient to carry.

    Which is your decision, an e ­book or a paper book?

    Nowadays, reading is becoming more and more important, so teachers always encourage(鼓励)their students to read more famous work like The Little Prince, Charlotte's Web and The Miraculous Journey of Edward Tulane and so on .

    Among them, the students like Charlotte's Web best. It's written by American author E.B. White .The novel tells a story of a pig named Wilbur and his friendship with a spider named Charlotte on a farm. When Wilbur is in danger of being killed for his meat by the farmer, Charlotte writes a message to praise（表扬） Wilbur in her web and saves him. Wilbur becomes famous in the village and he is safe in the end. When it came out in 1952, the book was welcomed by adults and children. And it's still very popular today.

    Do you have a tail? Of course not, we know. But tails are like opinions, actually, everyone has them: fishes, birds, most reptiles, and even some of our closest relatives

    Since tails first evolved(进化) at least 500 million years ago. Geckos (壁虎)use them to store fat. birds use them to steer through the air, But for most mammals (哺乳动物).{#blank#}1{#/blank#}Yet, as you get closer to humans on the evolutionary tree, tails disappear, Gorillas(大猩猩)don' t have them, and neither do chimps(黑猩猩) or any other apes (类人猿) including us, of course, To understand why, take a look at how we walk.

    {#blank#}2{#/blank#}walking like this gives us a huge advantage because unlike four﹣legged animals. which have to pour energy into every step they take, two legs take advantage of gravity(重力),which does some of the work for us. You see, each time we take a step, gravity pulls us forward. The end result is that when we walk, we use around 25% less energy than walking on all fours, and this way of getting around also totally eliminate (淘汰) the need for a tail.

    It's said that you can still see a reminder of a time when our ancient ancestors had one. Just look at a human spine(脊椎).{#blank#}3{#/blank#}That's your tailbone. It's all that's the rest of our tail.

    Now, babies are born with what looks like a tail, but that's not what's really going on. Most often, these tails are actually a parasitic twin(寄生虫). These types of tails usually form as a birth defect(瑕疵).{#blank#}4{#/blank#}

    So the tail of humans has gone, it's the result of evolution millions of years Will humans be much taller, stronger or smarter in the future?

A.  B.  C.

D.    E.