题目内容
6.You Are What You EatGenetic(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.
练习册系列答案
相关题目
7.When asked to explain made her remain so young,she began to teil us her secret.( )
A. | what it was that | B. | that what was it | ||
C. | it was what that | D. | what was it that |
4.______ in a heavy traffic is quite an unpleasant experience.( )
A. | Being caught | B. | Caught | C. | Catching | D. | Catch |
1.The simplest way to say it is this:I believe in my mother.My (11)A began when I was just a kid.I(12)Cbecoming a doctor.
My mother was a domestic.Through her work,she observed that (13)C people spent a lot more time reading than they (14)D watching television.She announced that my brother and I (15)A watch two to three pre-selected TV programs during the week.With our free time,we had to read two books each from the Detroit Public Library and (16)B her written book reports.She would mark them up with check marks and highlights.Years later,we realized her marks were a(17)D.My mother was illiterate.
When I entered high school,I was a(an)(18)A,but not for long.I wanted the fancy clothes.I wanted to(19)B the guys.I went from being an A-student to a B-student to a C-student.One night my mother came home from (20)C her various jobs and I complained about not ha ving enough Italian knit skirts.She said,"Okay,I'll give you all the money I make this week scrubbing floors and cleaning bathrooms,and you can buy(21)D food and pay the bills.With everything (22)A,you can have all the Italian knit skirts you want."I was very (23)B with that arrangement but once I got through allocating money,there was (24)D left.I realized my mother was a financial genius to be able to (25)C our heads and any kind of food on the table,(26)Abuy clothes.I also realized that immediate satisfaction wasn't going to get me anywhere.Success required intellectual preparation.I went back to my(27)C and became an A-student again,and eventually I (28)Bmy dream and I became a doctor.
My story is really my mother's story----a woman with(29)Aformal education or property,who used her position as a parent to change the lives of many people around the globe.There is no job (30)Cthan parenting.This I believe.
My mother was a domestic.Through her work,she observed that (13)C people spent a lot more time reading than they (14)D watching television.She announced that my brother and I (15)A watch two to three pre-selected TV programs during the week.With our free time,we had to read two books each from the Detroit Public Library and (16)B her written book reports.She would mark them up with check marks and highlights.Years later,we realized her marks were a(17)D.My mother was illiterate.
When I entered high school,I was a(an)(18)A,but not for long.I wanted the fancy clothes.I wanted to(19)B the guys.I went from being an A-student to a B-student to a C-student.One night my mother came home from (20)C her various jobs and I complained about not ha ving enough Italian knit skirts.She said,"Okay,I'll give you all the money I make this week scrubbing floors and cleaning bathrooms,and you can buy(21)D food and pay the bills.With everything (22)A,you can have all the Italian knit skirts you want."I was very (23)B with that arrangement but once I got through allocating money,there was (24)D left.I realized my mother was a financial genius to be able to (25)C our heads and any kind of food on the table,(26)Abuy clothes.I also realized that immediate satisfaction wasn't going to get me anywhere.Success required intellectual preparation.I went back to my(27)C and became an A-student again,and eventually I (28)Bmy dream and I became a doctor.
My story is really my mother's story----a woman with(29)Aformal education or property,who used her position as a parent to change the lives of many people around the globe.There is no job (30)Cthan parenting.This I believe.
11.A.belief | B.work | C.education | D.promise |
12.A.majored in | B.got used to | C.dreamed of | D.got tired of |
13.A.lazy | B.easy-going | C.successful | D.reliable |
14.A.spent | B.paid | C.took | D.did |
15.A.could only | B.could not | C.must not | D.should often |
16.A.read to | B.present to | C.teach | D.explain |
17.A.joke | B.means | C.tool | D.trick |
18.A.A-student | B.B-student | C.C-student | D.D-student |
19.A.get rid of | B.hang out with | C.break away from | D.keep in touch with |
20.A.making | B.stopping | C.working | D.getting |
21.A.your brother | B.yourself | C.your sister | D.the family |
22.A.left over | B.paid off | C.used up | D.carried out |
23.A.angry | B.pleased | C.disappointed | D.bored |
24.A.anything | B.everything | C.something | D.nothing |
25.A.put an idea into | B.gave an impression | C.keep a roof over | D.have eyes in the back of |
26 A.let alone | B.let out | C.let in | D.leave alone |
27.A.guys | B.mother | C.studies | D.play |
28.A.made | B.fulfilled | C.changed | D.tried |
29.A.little | B.much | C.few | D.high |
30.A.more interesting | B.less important | C.more important | D.less interesting. |
11.attempt( )
A. | always | B. | ball | C. | ashamed | D. | bathe |
18.The child tiptoed quietly to the bird.______ into the forest when he was about to catch it.( )
A. | Flew it away | B. | Away flew it | C. | Away it flew | D. | Flew away it |
16.society.
A. | achieve | B. | friend | C. | science | D. | believe |