亨森Shortly after he achieved freedom Henson became intent on assisting fugitive sl aves. He secretly returned to the United States from Canada several times to he lp others to travel the Underground Railroad to freedom. Once some slave catche rs closed in on the escaping slaves and Henson when they were on the run. He d isguised them and successfully avoided capture. Later he built a small settleme nt in Dresden in Canada for escaped slaves, setting up a chapel and a school. H e held to the conviction that slavery would be abolished, and the day was bound to come when racial discrimination no longer existed.人们It is almost impossible to keep a determined burglar out. All you can do is dis courage him for a few minutes. Thus exposing him to police patrols. Common sens e tells us that lighting is a barrier to criminal activity. A light should be f ixed in the doorway and switched on at night. Make sure/Assure yourself that yo u don't leave the door on the latch if you happen to be the last to come in. If you decide to buy a sophisticated electronic alarm system, be sure to ask for its signs and put them up on both windows and doors. In addition you may have i t hooked up to a police station我们Here and there we see young artists who stand out from other people. They may b e in worn out jeans all the year round, or walk barefoot / in bare feet even in winter, or drink to excess, or cling to the fancy of creating a masterpiece wi thout actually doing any creative work. In fact, many of them act like this jus t to look the part, or to be "in tune with" other artists. They have forgotten that only through persistent effort can one achieve success.1997Dolly the sheep resulted from a cloning experiment by a group of Scottish scien tists in 1997. A fierce debate on human cloning has ever since been going on. T his contentious issue has focused on ethical and social implications of the tec hnology:what the technology might do to the very meaning of human reproduction, child rearing, individuality, etc.The majority of scientists are adamantly opposed to reproductive cloning and su pport therapeutic cloning for treating diseases. The reason is that therapeutic cloning does not involve any type of relief of suffering in human beings. Scie ntists believe that with politics and monitoring in place to ensure that therap eutic cloning is used safely, we can all benefit from this procedure.The Underground Railroad was forged by the rfforts of those who were prepared to fight against slavery and stand up for the long-suffering Southern black Americans.Some of those who helped to transport slaves to the north and freedom were former slaves themselves.Others felt compelled to take part because of their deeply held comvictionsEor many of those involved,liberating the slaves from those who exploned them became a mission.While their eventual goal was to abolish slavery completely,in the meantime they were intent on helping to free as many slaves aspossible,offen at considerable risk.In the eyes of slave owners,they were dangerous enemies and frequently received death threats.Statistics show that crime in rural areas is now rising faster than in the cities.the era when the countryside stood for safety and security has long gone. No longer is it safe anywhere to go out leaving the door on the latch.We all feel Vulnerableand seek to strengthen the barrier we use to hold criminals at bay.These can range from old fashioned bolts and bars to the latest electric devices.A moment’s reflection,however is enough to being us face to face with the following pizzle:we may have lockedthe evils out,but in doing so we have locked ourselves in.Thishhardlu seems a civilized way of life.I had only know Johnsy a few months when she fell vicim to the disease.We had met in May and finding ourselves so much in tune,had set up hometogether.Then,inNovember,she became ill.Scarcely able to speak in a whisper,she seemed unable to cling to life,It was such a change.Before she had always been so lively and merry.Now she just sat up in bed staring out of the window.She had this strange belief that once the last leaf on thevine outside fell,she would die.I told her it was all nonsense,but to no effect. It was our downstairsneighbor,Mr.Behrman,who came to her rescue.When he hered of Johnsy’s strange fancy he flew into a fierce temper,regarding it as a sin that one so young should give up life so easily.Thanks to Behrman,the last leaf never did fall. Late at night he had climbed up and painted the leaf in the wall. It was his long-promised masterpiece.In his interview, Samuel Wood discusses the issue of human cloning. It is, he freely admits, a contentious one. He personally does not approve of producing human clones for reproductive purposes, as he believes this has great potential to provide new means to fight disease. Nonetheless, there are those who condemn human cloning in this area also. Partly this stems from misconception about what is involved, but partly the opposition comes from differences in deeply held values. Wood names the Pope and President Bush as two notable opponents of his work. Wood’s own commitment to his research result from the promise he made to himself to look for a cure to the disease from which his mother died. It was a promise that was later to lead him to come forward in public as the first man to clone himself. This he did by transplanting one of his own cells into a clonated egg from which the genetic material had been removed。