A young man entered the last interview of a company. The director learnt that the young man's academic (学业的) grades were very good. "Did you get any scholarships (奖学金) in school?" the director asked. "None." The young man answered. "Did your father pay for your school fees?" the director asked. "My father died when I was one year old, so my mother paid my school fees." The young man answered.

    "Where did your mother work?" the director asked. "My mother washed clothes." The young man said. The director looked at the young man's hands. He had a pair of smooth and perfect hands.

    "Have you ever helped your mother wash the clothes before?" the director asked. "Never." The young man answered. "I have a request," the director said. When you go back today, wash your mother's hands, and then see me tomorrow morning."

    The young man felt that his chance of getting the job was high. When he went back. He happily asked his mother to let him wash her hands. His mother felt strange, happy but with mixed feelings. She showed her hands to the kid. The young man washed his mother's hands slowly. His tears fell when he did that. It was the first time he had noticed that his mother's hands were so wrinkled (有皱纹的).He realized it was this pair of hands that helped him pay the fees.

    The next morning, the young man went to the director's office. "I washed my mother's hands, and I know that without my mother, I would not be the person I am today." He said.

    "This is what I am looking for," the director said. "I want a person who can appreciate (感激) the help of others to get things done. You will be a member of our company.

    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?

{#blank#}1{#/blank#}⑴Tommy: I like to have this class best because I like playing basketball and soccer very much.

{#blank#}2{#/blank#}⑵Cindy: In the class, I can learn to play many  kinds of instruments(乐器). I can also learn to sing many new songs.

{#blank#}3{#/blank#}⑶Wendy: I love this class best because the language is becoming more and more important (越来越重要) in the world.

{#blank#}4{#/blank#}⑷Ted: Many girls think it is hard to learn it well，but I like it best. It's is difficult sometimes, but it is interesting.

{#blank#}5{#/blank#}⑸Lin Xi: I like it best because it is my mother tongue(母语).It is one of the oldest(最古老的) languages in the world.