公共英語(yǔ)PETS二級(jí)閱讀復(fù)習(xí)(33)

　　The first cloning experiments in the 1950s involved frogs and toads. It was not until 1997 that scientists successfully cloned the first mammal, the now world-famous sheep known as Dolly. Cloning techniques have continued to improve since then, and today there are cloned mice, salmon, and cattle.

　　克隆實(shí)驗(yàn)開(kāi)始于20世紀(jì)50年代，對(duì)象為青蛙和蟾蜍。直到1997年，科學(xué)家才成功地克隆了哺乳類動(dòng)物，即世界聞名的“多莉羊”。克隆技術(shù)從那時(shí)起得到了持續(xù)的進(jìn)展，今天已有了克隆老鼠、克隆鮭魚和克隆牛。

　　公共英語(yǔ)PETS二級(jí)閱讀復(fù)習(xí)(34)

　　Saving lives has always been an important mission of science. Now science, and indeed all society, is facing a new dilemma: whether or not to try and save more lives through human cloning.

　　挽救生命一直是科學(xué)研究的一項(xiàng)重要使命。如今，科學(xué)研究，其實(shí)是整個(gè)社會(huì)，正面臨著一個(gè)新的困境：是否要設(shè)法通過(guò)克隆人類來(lái)挽救更多的生命。