GRE isse写作之自己总结的万能例子.doc

Renaissance For example, the helpless fate can be felt from the tragedy works, written by Shakespeare. Mona Lisa, created by Beethoven, revealed the mysterious and implicit smile. Although works completed by different artists and writers revealed slight variations in the access, performing form, and social aspect focusing on, as far as common theme and hidden ideas were concerned, the obvious similries to each other seemed much more than any of the minute differences, namely, resisting the feudalization and corrupt institution and enlightening freedom of human being. This is called “Renaissance” in the history. Genetic engineering 迄今为止，基因工程还没有用于人体，但已在从细菌到家畜的几乎所有非人生命物体上做了实验，并取得了成功。事实上，所有用于治疗糖尿病的胰岛素都来自一种细菌，其ＤＮＡ中被插入人类可产生胰岛素的基因，细菌便可自行复制胰岛素。基因工程技术使得许多植物具有了抗病虫害和抗除草剂的能力；在美国，大约有一半的大豆和四分之一的玉米都是转基因的。目前，是否该在农业中采用转基因动植物已成为人们争论的焦点：支持者认为，转基因的农产品更容易生长，也含有更多的营养（甚至药物），有助于减缓世界范围内的饥荒和疾病；而反对者则认为，在农产品中引入新的基因会产生副作用，尤其是会破坏环境。　 诚然，仍有许多基因的功能及其协同工作的方式不为人类所知，但想到利用基因工程可使番茄具有抗癌作用、使鲑鱼长得比自然界中的大几倍、使宠物不再会引起过敏，许多人便希望也可以对人类基因做类似的修改。毕竟，胚胎遗传病筛查、基因修复和基因工程等技术不仅可用于治疗疾病，也为改变诸如眼睛的颜色、智力等其他人类特性提供了可能。比如，运用此技术，可使患儿的父母生一个和患儿骨髓匹配的孩子，然后再通过骨髓移植来治愈患儿。 So far, genetic engineering has not been used in human, but it has achieved successful experiment in almost all the objects on non-human life--from bacteria to livestock already. In fact, all the insulin treatment for diabetes come from a kind of bacteria which can be inserted into a human genes to make copies of insulin by bacteria oneself. Genetic engineering technology makes many plants have the disease-resistant ability and herbicide, In the USA, about half of soybean and a quarter of corn is genetically modified. At present, whether the transgenic plants used in agriculture has become the focus of debate, transgenic supporters think: the agricultural is faster to growth, and easier to contain more nutrition (even medicine), to help slow down worldwide famine and disease, But opponents argued, introducing new genes into agricultural will occur side effects, espe