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6.You Are What You Eat
Genetic(基因的)engineering is the scientific change of the genetic material in a living organism. It allows scientists to identify specific genes,to remove them from an organism's chromosomes (染色体),improve them,analyze them,and possibly clone them,and to then reinsert the changed gene into the original organism,or a completely different organism.Unlike traditional breeding (繁殖),where a desired quality would be bred within the same species,genetic engineering can insert desired ones into organisms of different species.Wow…Did you catch that?
Genetic engineering creates many positive contributions to agriculture. For example,by genetically engineered(GE) foods,anti-cancer agents,minerals and vitamins can be increased.Improved taste,shelf life,and better transport are all possible.Also,GE plants can increase pest and bacterial resistance,therefore,making the food safe for consumers.
But some argue that the possible negative effects outweigh the positives,and critics are starting to voice their concerns.  Unlike Europe,in the United States labeling is not required on genetically engineered foods or on foods that contain genetically engineered products. Most Americans do not realize that they are,in fact,eating GE foods.
The public is also concerned about the unknown health risks.With limited understanding of genes,scientists cannot predict possible effects.Because most genes introduced into GE plants come from sources not introduced into the human body,it is impossible to know if they will cause reactions. Moreover,due to the lack of labeling if allergies develop,it will be extremely difficult to find the origin of them.
There is also a major moral question in many minds.For many,the conflict is not if it is safe or not,but it disturbs them because it is unnatural and unnecessary.We are currently producing one and a half times the amount of food needed to feed the world,yet one in seven people are starving.GE food is unnecessary,and fails to address the root of hunger. Many believe that the only people who will benefit are the corporations that produce it.
Scientists cannot foresee t.he possible effects of GE foods,yet we eat them every day without even knowing it.We already have enough food,so why create more that could be potentially harmful to us,to the Earth and to all wildlife?I think that the benefits are amazing,but until we know for sure how these foods will affect us,they are not worth the risk.

67.According to the passage,traditional breeding is different from genetic engineering in thatC.
A.traditional breeding changes the genes in the same species
B.traditional breeding changes the genes in different species
C.traditional breeding takes place within the same species
D.traditional breeding is more scientific
68."The lack of labeling"in Paragraph 4indicatesA.
A.information concerning gene sources is unavailable to customers
B.it is currently possible to find the origins of some allergies
C.scientists try to hide potential dangers from customers
D.the US government is responsible for GE food
69.According to Paragraph 5,GE food is unnecessary becauseA.
A.it won't help solve the problem of hunger in the world
B.there are potential dangers in producing GE food
C.we're now producing more food than before
D.customers will benefit from GE food
70.What is the author's attitude towards genetic engineering?B
A.Welcoming.  B.Disapproving.   C.Unconcerned.   D.Optimistic.

分析 本文主要介绍了基因工程技术.基因工程可以将所需的生物转化为不同物种的生物,它为农业做出了巨大的贡献.而转基因食品是不必要的,因为它不会帮助解决世界上的饥饿问题,并且还可能存在一些隐患.

解答 67.C推理判断题.根据第一段Unlike traditional breeding (繁殖),where a desired quality would be bred within the same species,genetic engineering can insert desired ones into organisms of different species.可知传统育种不同于基因育种,传统育种发生在同一物种之间.故选C.
68.A细节推理题.根据第四段due to the lack of labeling if allergies develop,it will be extremely difficult to find the origin of them.可知由于缺乏信息的记录,如果过敏原发展,将很难找到他们的起源.由此推知,"The lack of labeling"暗示了关于基因的来源对于客户来说是不可获取的.故选A.
69.A细节理解题.根据第五段GE food is unnecessary,and fails to address the root of hunger.可知转基因食品是不必要的,因为它不会帮助解决世界上的饥饿问题.故选A.
70.B细节理解题.根据最后一段可知作者不赞同转基因技术.故选B.

点评 本文考察学生的理解推断能力以及细心程度,只要抓住文章的关键词,采用寻读的方法查找细节,就能找到正确答案.

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