【正文】 mammoth, Tasmanian tiger, or dinosaur is much more difficult due to the lack of properly well preserved the other hand, for example, a gaur can have a cow as a_surrogate_mother,_definitely not a monkey. But what about an extinct animals as unique as the panda? What species could possibly serve as a surrogate mother? Cloning presents many exciting possibilities. However, even if extinct animals are brought back, they could not survive in today39。s only do most extinct animals have no habitat to love in, but the other plants and animals they depended on for food may also be gone as well. 【語篇解讀】 我們可以克隆瀕臨滅絕的動物嗎？我們能克隆已經(jīng)滅絕的動物嗎？ 44． It can be learned from the text that________. A． the gaur is an extinct species B． the gaur lives in Asia and is endangered C． scientists have cloned the African bongo antelope D． both the cheetah and the giant panda live in Asia 解析 由 a rare ox like animal from southeast Asia(一種來自亞洲最南部罕見的長得象牛一樣的動物 )和 Other endangered species that may be cloned(其他遍臨滅絕的物種 )可知。 答案 B 45． The underlined words “a surrogate mother” probably refer to a female who________. A． gives birth to a baby of its own B． cannot give birth to a baby C． gives birth to a baby for another female D． provides DNA 解析 由 and a closely related species(和一種極其相近的物種 )，可知。其實通過文章意思也不難猜出它的意思。 答案 C 46． The difficulty in cloning an extinct species is the lack of________. A． both the well preserved DNA and a surrogate mother B． both the habitat to live in and the well preserved DNA C． both the well preserved DNA and plants to live on D． both the habitat to live in and plants to live on 解析 由 much more difficult due to the lack of properly well preserved DNA.(要更加困難，由于缺乏完好的妥善保存的 DNA。 )和 What species could possibly serve as a surrogate mother？ (什么物種可以作為代孕母親 )可知。 答案 A 47． In the author39。s opinion, it is possible that________. A． all the extinct species may be cloned B． extinct species may be cloned and easily survive C． a gaur can have a monkey as a surrogate mother D． some extinct species may be cloned, but not survive 解析 由 even if extinct animals were brought back, they could not survive in today39。s world.(即使滅絕的動物能夠被克隆回來，他們也無法在現(xiàn)今的世界中存活 )可知。 答案 D D The United States government wants to know what the public thinks about its findings on the safety of cloned animals. The Food and Drug Administration says meat and milk from clones of adult cattle, pigs and goats are safe to eat. An F． called them “as safe to eat as the food we eat every day.” And when those clones reproduce sexually(有性繁殖 ), the agency says, their offspring(后代 ) are safe to eat as well. But research on cloned sheep is limited. So the F． that sheep clones not be used for human food. The United States this year could bee the first country to approve the sale of foods from cloned animals. First, however, the public will have niy days to ment on three proposed documents. On December 28th the F． a long report, called a draft risk assessment, along with two policy documents. The agency says it must receive ments by April second. The F． ready to act several years ago, but an advisory mittee called for more research. For now, the government will continue to ask producers to honor a request that they not sell foods from cloned animals. Clones are still rare. They cost a lot and are difficult to produce. The F． most food from cloning is expected to e not from clones themselves, but from their sexually reproduced offspring. It says clones are expected to be used mostly as breeding animals to spread good qualities. Public opinion studies show most Americans do not like the idea of food from cloned animals. But this research also shows the public knows little about cloning. Cloning differs from geic engineering. A cell taken from a so called donor animals is grown into an embryo(胚胎 )in the laboratory. Next, the embryo is placed into the uterus(子宮 )of a female animal. If the process is successful, the pregnancy reaches full term and a geic copy of the donor animal is born. 【語篇解讀】 用克隆動物制造的食物是否安全，已經(jīng)得美國各界人士的關注 ?? 48. From the passage we know that________. A． foods from cloned animals are popular in America B． cloned adult animals are safe to eat except sheep C． cloned animals will be easy to produce D． most foods from cloning is expected to take place of other foods 解析 推理判斷題。從文中第二段可推出。 答案 B 49． The main purpose of the text is to________. A． tell an interesting story B． give some advice on foods C． give a report D． pare different opinions 解析 主旨大意題。本篇文章是關于克隆食物的安全問題的報道。 答案 C 50. Who believe that foods from cloning are safe to eat? A． Most Americans. B． An advisory mittee. C． Critics. D． The F． . 解析 事實細節(jié)題。從 “The Food and Drug Administration says meat and milk from clones of adult cattle, pigs and goats are safe to eat....”可知。 答案 D 51． It can be inferred from the last paragraph that________. A． cloning has much in mon with geic B． not every cell taken from a donor animal can grow into a geic copy C． the donor animal should be a female one D． cloned animals grow faster than normal ones 解析 推理判斷題。從最后一段 “If the process is successful, the pregnancy reaches full term and a geic copy of the donor animal is born.”可知答案。 答案 B E Good ， this is not how I expected to wake up this I received the news， Malia walked in and said， “ Daddy， you won the Nobel Peace Prize， and it is Bo39。s birthday！ ” And then Sasha added， “ Plus， we have a three day weekend ing up.” So it39。s good to have kids to keep things in perspective. I am both surprised and deeply humbled by the decision of the Nobel me be clear： I do not view it as a recognition of my own acplishments， but rather as an affirmation of American leadership on behalf of aspirations held by people in all nations. To be honest， I do not fe