【正文】 e group to overe illnesses. Diversity in a group means having animals with their genes arranged in different ways. The advantage is that if there is a new illness some of these animals may die,but others will survive and pass on the ability to resist that disease to the next generation. The great drawback to cloning a group ofanimals is that they would all have the same arrangement of genes and so might die of the same illness. Then none of them would be left to continue the species. ◎ It would be unfair to clone any extinct animals if they were to live in a zoo. A suitable habitat would be needed for them to lead a natural life. Based on what we know now, you cannot clone animals that have been extinct longer than 10,000 years. Actually, dinosaurs disappeared 65,000,000 years ago. So the chance of dinosaurs ever returning to the earth is merely a dream.恐龍的回歸？ 克隆兇猛和滅絕的野生動物的可能性一直使電影制片商感到興奮。Using LanguageReading，discussing and writingTHE RETURN OF THE DINOSAURS? The possibility of cloning fierce and extinct wild animals has always excited film makers. And they are not the only ones! The popularity of films such as Jurassic Park, in which a scientist clones several kinds of extinct dinosaurs, proves how the idea struck a mixture of fear and excitement into people39。但是其他國家如中國和英國，則還在繼續(xù)收集克隆技術(shù)有可能提供豐富有的醫(yī)療救助的證據(jù)。宗教領(lǐng)袖也提出了道德方面的問題。它引起了爭議，因為它突然打開了人們的眼界，看到了有可能：用克隆技術(shù)來治療重病，甚至克隆出人類?？杀氖牵瑯訜o法控制的命運也在影響著其他物種，如克隆鼠。研究克隆的科學家發(fā)現(xiàn)多莉得的病更容易發(fā)生在年老的羊身上．這讓他們很沮喪。多莉看來是在正常地成長著，這很令人鼓舞。 9．這頭小羔羊就是母羊(B)所提，供的細胞核克隆而成的。7．細胞分裂并生長成胚胎。5．取出該細胞的細胞核。4．母羊(B)提供一個供克隆的軀干細胞。2．在卵細胞中取出細胞核。但是，科學家的決心和耐心最終得到了回報，這就是1996年具有突破性的克隆羊“多莉”的誕生?？寺≈参锖唵?，但克隆動物就比較復雜了，是一項很難完成的任務(wù)。 克隆技術(shù)有兩大用途。這種現(xiàn)象也發(fā)生在動物身上，從同一個原生卵子產(chǎn)生性別和相貌相同的雙胞胎也是克隆。這是一種用來生產(chǎn)與原型完全相同的動植物的方法。s appearance raised a storm of objections and had a great impact on the media and public imagination. It became controversial. It suddenly opened everybody39。 第二單元 克隆ReadingCLONING: WHERE IS IT LEADING US? Cloning has always been with us and is here to stay. It is a way of making an exact copy of another animal or plant. It happens in plants when gardeners take cuttings from growing plants to make new ones. It also happens in animals when twins identical in sex and appearance are produced from the same original egg. The fact is that these are both examples of natural clones.Cloning has two major uses. Firstly, gardeners use it all the time to produce mercial quantities of plants. Secondly, it is valuable for research on new plant species and for medical research on animals. Cloning plants is straightforward while cloning animals is very plicated. It is a difficult task to undertake. Many attempts to clone mammals failed. But at last the determination and patience of the scientists paid off in 1996 with a breakthrough the cloning of Dolly the sheep. The procedure works like this: On the one hand, the whole scientific world followed the progress of the first successful clone, Dolly the sheep. The fact that she seemed to develop normally was very encouraging. Then came the disturbing news that Dolly had bee seriously ill. Cloning scientists were cast down to find that Dolly39。 CloningUnit1940年民政部門改革了制度，使得更多的中國人能夠得到機會定居美國。悲慘的境遇對他們來說似乎是一種懲罰而談不上公正和自由。從1882年至1940年，天使島成為一個著名的移民站，許多中國人在那兒申請美國居住權(quán)。吃了一頓可口的飯菜，然后步行下山回到酒店。博物館里有關(guān)于中國移民史的文件、照片和各種各樣的物品，但是晚上關(guān)門了。建筑物面前裝飾得就像在中國南部地區(qū)的古建筑一樣。 傍晚，跟彼得和泰莉一起去中國城。途中多次停車，從不同角度欣賞城市風景并攝影。車身上有藍白兩色相間的標記，上面有海鷗以表示要去的路線。一整天驅(qū)車游覽城市。 在漁人碼頭看了這么多東西，我太累了，什么也不想干了。如今這兒是一個旅游區(qū)了，很多商店、海鮮館和面包坊。 午餐是在漁人碼頭吃的，吃得很晚。哈利迪發(fā)明的，他試圖找到一種比馬拉的軌道車更好的交通方式。先是乘纜車，在山頂攬勝，觀看舊金山灣及整個城市。s like. In evening, went to Chinatown with Peter and Terri. Chinese immigrants settled in this area in the 1850s. The fronts of the buildings are decorated to look like old buildings in southern China. Saw some interesting temples here, a number of markets and a great many restaurants. Also art galleries and a museum containing documents, photographs and all sorts of objects about the history of Chinese immigration, but it is closed in the evening. Will go back during the day. Had a delicious meal and then walked down the hill to our hotel.Wednesday 14th, June In morning, took ferry to Angel Island from the port in San Francisco Bay. On the way had a good view of the Golden Gate Bridge. From 1882 to 1940 Angel Island was a famous immigration station where many Chinese people applied for right to live in USA. The cells in the station were very small, cold and damp。s a fascinating drive marked out for tourists. It has blue and white signs with seagulls on them to show the way to go. It39。s What. Am exhausted and don39。s a tourist area with lots of shops, sea food restaurants and bakeries. It39。s brakes failed, the conductor could not control the situation and the tram slipped down the hill dragging the horses with it. Had a late lunch at Fisherman39。Using LanguageReading and writingGEORGE’S DIARY 12TH—14TH JUNEMonday 12th, June Arrived early this morning by bus. Went straight to hotel to drop my luggage, shower and shave. Then went exploring. First thing was a ride on a cable car. From top of the hill got a spectacular view of San Francisco Bay and the city. Built in 1873, the cable car system was invented by Andrew Hallidie, who wanted to find a better form of transport than horsedrawn trams. Apparently he39。未來展望 世界各地的人，由于受到氣候條件和生活方式的吸引，仍然在繼續(xù)遷入加利福尼亞。最近期的移民 在最近的幾十年里，加利福尼亞成了更多的亞洲人的家，包括朝鮮人、柬埔寨人、越南人和老撾人。非洲人從1 9世紀就在加利福尼亞住下來，他們是從墨西哥向北遷來的。今天，加利福尼亞的猶太人口在美國占第二位。 20世紀20年代，電影業(yè)在加州的好萊塢建立了起來。 19世紀后期，其他國家的移民，比如意大利人來到了加利福尼亞，他們主要是漁民，也有制酒工人。后來的移民 雖然中國移民在淘金熱時期就開始到來了，但是更大批量的移民卻是在1 9世紀60年代為了修建貫穿美國東西海岸的鐵路而來的。一些人死了或回家了，但是盡管條件十分艱苦，多數(shù)人還是留在了加利福尼亞勞作謀生，并在新的城鎮(zhèn)或農(nóng)場里定居下來。隨后跟著來的有歐洲和亞洲的探險家。發(fā)財夢很快就吸引了世界各地的人。今天，住在圣弗朗西斯科（舊金山）及其周邊地區(qū)的美籍俄羅斯人約有25,000人。這就是為什么今天還有40%的加利福尼亞人仍然把西班牙語作為第一或第二語言的緣故。1846年美國向墨西哥宣戰(zhàn)，美國贏得戰(zhàn)爭勝利后，墨西哥被迫把加利福尼亞割讓給美國。在首批移居加州的西班牙人中，大部分是宗教人士，他們的職責是向原住民傳授天主教。西班牙人 在18世紀的時候，加利福尼亞是由西班牙統(tǒng)治的西班牙士兵最早是在1 6世紀初期來到南美洲的，他們同土著人打仗，并奪去了他們的土地。此外，歐洲人帶來了疾病，使許多人染病而死，不過，還是有一些人在經(jīng)歷