题目内容
4.Scientists in Argentina have created the world's first cow to own two human genes that will enable it to produce human-like milk,which is matchless up to now.It is a breakthrough in the area of clone.Genetic engineering was used to introduce the"mothers'milk"genes into the animal before birth,according to the National Institute of Agribusiness Technology in Buenos Aires.
As an adult,the cloned cow"will produce milk that is similar to humans"in what will prove"a development of great importance for the nutrition of infants",it said in a statement.
"The cloned cow,named Rosita ISA,is the first one born in the world that owns two human genes that contain the proteins present in human milk,"the statement said.
In April,scientists in China published details of research showing that they had created GM Holstein dairy cows which produced milk containing proteins found in human breast milk.
But the Argentine team says the Chinese only introduced one human gene,whereas their research involved two genes meaning the milk will more closely resemble that of humans.
Rosita ISA was born on April 6and was delivered by Caesarean section because she weighed around 100pounds,roughly twice the normal weight of Jersey cows.
Adrian Mutto,from the National University of San Martin said"Our goal was to raise nutritional value of cows'milk by adding two human genes,the protein lactoferrin and lysozyme,which can provide newly-born babies with anti-bacterial and anti-viral protection."
Cristina Kirchner,President of Argentina,said that the scientific institute"makes all proud."She also revealed that she had rejected the"honor"of having the cow named after her."They came to tell me that the name is Cristina,but what woman would like to have a cow named after her?It appeared to me to be more appropriate to call it Rosita."
28.What can we know about Rosita ISA according to the passage?D
A.It is as heavy as Jersey cows.
B.It is the first cow with a human gene.
C.Its milk has the same proteins as human breast milk.
D.Its milk has larger nutritional value than others'.
29.Lactoferrin and lysozyme in milkA.
A.are good for babies'health
B.help provide more milk from cow
C.can increase the production of milk
D.can offer more proteins in cow milk
30.We can infer from the last paragraph thatB.
A.it is hard to name the cow
B.honorable as it is,no women like the cow named after them
C.the president wants the cow named after her
D.Cristina Kirchner objects to creating the cloned cow
31.What would be the best title of the passage?C
A.Scientists in Argentina could produce human milk
B.The cloned cow would bring about benefits
C.Scientists create cow that produces"human"milk
D.How was the cloned cow born?
分析 本文主要讲述了科学家通过植入人类基因,克隆出了能产出与母乳相似牛奶的奶牛.这是一个极大的突破.
解答 28.D 细节理解题.根据文章内容,The cloned cow,named Rosita ISA,is the first one born in the world that owns two human genes that contain the proteins present in human milk,"the statement said.被克隆出来的这只奶牛名叫 Rosita ISA,它是世界上第一只出生的拥有2类人类基因的奶牛.而这一特点使得它产的奶蕴含人类所需的东西,更适宜婴儿.结合选项,故选D.
29.A 细节理解题.根据文章内容,Our goal was to raise nutritional value of cows'milk by adding two human genes,the protein lactoferrin and lysozyme,which can provide newly-born babies with anti-bacterial and anti-viral protection."由此可知,乳铁传递蛋白和溶解酵素都可以让新生儿抵抗病菌,对身体有益,结合选项,故选A.
30.B 推理判断题.根据文章内容,She also revealed that she had rejected the"honor"of having the cow named after her."They came to tell me that the name is Cristina,but what woman would like to have a cow named after her?It appeared to me to be more appropriate to call it Rosita."由此可知,Cristina Kirchner认为克隆奶牛以她的名字命名是一件很恐怖的事情.没有任何一个女人是会愿意以自己的名字来命名克隆奶牛的.结合选项,故选B.
31.C 主旨大意题.根据文章内容,本文主要讲述了科学家通过植入人类基因,克隆出了能产出与母乳相似牛奶的奶牛.这是一个极大的突破.结合选项,故选C.
点评 本文是一个科教类阅读,题目涉及多道细节理解题,做题时结合原文和题目有针对性的找出相关语句进行仔细分析,结合选项选出正确答案.推理判断题也是要在抓住关键句子的基础上合理的分析才能得出正确答案,切忌胡乱猜测,一定要做到有理有据.