GRE-issue写作之自己总结的万能例子

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

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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, especially destroy the environment.

Advantage:

Admittedly, ethicist rejected the innovative development of genetic engineering because, although it resolved some problems, it also produced new complications. Nevertheless,

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there are still many genes function and work principle beyond human knowledge, but using genetic engineering can make the tomatoes have anti-cancer effects, make the salmon bigger than in nature, and also make pet no longer allergy, many people are expect to do similar human genetic modification. After all, gene engineering technology can not only cure the disease, also make most possibility for change human characteristics, such as eye color, intelligence and others. For example, by using this technology, it is possible to make the parents pregnant to born a baby whose bone matches one needs homogenous bone, and then through the bone marrow transplants to cure patients.

We said the advantages and disadvantages of biological technology, is mainly refers to the genetic engineering.

弊:1) 克隆将减少遗传变异，通过克隆产生的个体具有同样的遗传基因，同样的疾病敏感性，一种疾病就可以毁灭整个由克隆产生的群体。可以设想，如果一个国家的牛群都是同一个克隆产物，一种并不严重的病毒就可能毁灭全国的畜牧业。

2) 克隆技术的使用将使人们倾向于大量繁殖现有种群中最有利用价值的个体，而不是按自然规律促进整个种群的优胜劣汰。从这个意义上说，克隆技术干扰了自然进化过程.

7) 克隆技术对家庭关系带来的影响也将是巨大的。一个由父亲的DNA克隆生成的孩子可以看作父亲的双胞胎兄弟，只不过延迟了几十年出生而已。很难设想，当一个人发现自己只不过是另外一个人的完全复制品，他（或她）会有什么感受

所以说,科学技术有时就是一把双刃剑,有利也有没弊,没有标准答案!就看人们这样利用了! Disadvantages:

1) genetic engineering would reduce the genetic variation of individuals and own the same diseases sensitivity , as a result, a disease can destroy whole colony by cloning. So we can imagine that, if a nation is the same cloned cattle, a kind of the virus could destroy the animal husbandry.

2) The use of genetic engineering will make people tend to propagate the most value individual within existing colony, rather than the natural law of survival. In this sense, the cloning technology will interrupt the procession of natural evolution. Interference

7) genetic engineering will lead a great influence on family relationships. A father of the DNA can be seen as twin brothers, but only delayed for decades. It is hard to imagine that, when a man found himself was just another man's fully reproductions, what feelings will he or she have

So, science and technology is a double-edged sword, sometimes, there are no harm and no standard answer! Just look like people to use!

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Galileo

Galileo, Italian astronomer and physicist, discovered law of uniform acceleration of falling bodies.